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1/4-Inch Cobalt Steel M35 Jobber Length Twist Drill Bits for Hard Metal, Stainless Steel, Pack of 12

4.6 4.6 out of 5 stars 2,232 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Jobber Drill Bits by Drill Hulk
$26.88 with 10 percent savings $2.24 per Count
List Price: $29.77

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Purchase options and add-ons

Material High-Speed Steel and 5% Cobalt
Cutting Diameter 0.25 Inches
Finish Type Gold Oxide
Shank Type 3-Flat
Cutting Angle String 135 Degrees

About this item

  • JOBBER LENGTH: 1/4-inch cutting diameter, 2-3/4-inch flute length, 4-inch overall length, 135 degree split point, 3-flat shank
  • MADE FROM HIGH-SPEED STEEL AND 5% COBALT: improve much higher heat resistance because of cobalt steel's high red hardness, provide strong durable performance compared to typical hss drill bits
  • CAN BE REPEATEDLY SHARPENED AS NEEDED: cobalt drill bit's hardness is uniform throughout the entire material, so that can be repeatedly sharpened without damaging the cutting edge allowing it to drill more than hss drill bits
  • APPLICATION: best used for drilling in hard metal, including stainless steel
  • INCLUDE: 12 pieces of 1/4-inch cobalt drill bits with case

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This product has fewer returns than average compared to similar products.

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1/4-Inch Cobalt Steel M35 Jobber Length Twist Drill Bits for Hard Metal, Stainless Steel, Pack of 12
$26.88 ($2.24/Count)
Get it as soon as Monday, May 13
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Sold by DrillHulk and ships from Amazon Fulfillment.
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Owl Tools 3/8" Inch Cobalt Drill Bits - 13 Pack of M35 Cobalt Drill Bits with Storage Case - Perfect Drill Bits for Metal, Ha
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amoolo 3/8" Cobalt Drill Bit(5Pcs), M35 HSS Metal Drill Bit Set for Hard Metal, Stainless Steel, Cast Iron
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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Package Dimensions ‏ : ‎ 3.62 x 1.1 x 1.06 inches; 7.83 ounces
  • Item model number ‏ : ‎ DHCO33
  • Date First Available ‏ : ‎ January 3, 2020
  • Manufacturer ‏ : ‎ Drill Hulk Ltd
  • ASIN ‏ : ‎ B083G29SKW
  • Country of Origin ‏ : ‎ China
  • Customer Reviews:
    4.6 4.6 out of 5 stars 2,232 ratings

Product Description

1/4 cobalt drill bit

135° Split Point

3-Flat Shank

For Hard Metal

Cobalt

Made from high speed steel and 5% cobalt. The additional of cobalt improves heat resistance and red hardness.

135° Split Point

Best for portable drills. Reduce drill walking, require less force than 118° point.

3-Flat Shank

Provide a secure grip in chucks, keep drills from slipping in your keyless chucks.

For Hard Metal

Perform better than normal high speed steel drill bit in drilling through harder materials especially stainless steel.

1/4 cobalt drill bit

Drill Hulk cobalt drill bits are made from high-speed steel and 5% cobalt.

The addition of cobalt improves strong durable performance in harder materials especially stainless steel.

Made in China

You Will Get:

12 pieces of 1/4-inch. x 4-inch. cobalt drill bits with case

Notice:

For high-speed drilling through metal, lubricate the bit with lightweight oil.

Warning:

Drill bits can shatter during use.

Always wear safety goggles and safety items when drilling.

California Proposition 65 Warnings: California requires the following notice: WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.

1/4 cobalt 1/4 titanium cobalt drill bit set
DHCO33 DHTI33 DHCO13
Customer Reviews
4.6 out of 5 stars
2,232
4.6 out of 5 stars
898
4.6 out of 5 stars
2,232
Price $26.88 $21.98 $16.98
Drill Diameter 1/4 inch 1/4 inch 1/16 - 1/4 inch
Overall Length 4 inch 4 inch Set
Material Cobalt Steel M2 High Speed Steel Cobalt Steel
Best For Hard Metal, including Stainless Steel Medium and Softer Materials, Soft Metal, PVC and Wood Hard Metal, including Stainless Steel

Looking for specific info?

Customer reviews

4.6 out of 5 stars
4.6 out of 5
2,232 global ratings

Customers say

Customers like the value, quality and sharpness of the drill bits. For example, they mention it's a great value for the money, they outlast any drill bits they have used in the past and that they stay sharp for as long as any bit they have worked with. That said some complain about the durability, saying that they dull immediately when near steel. Opinions are mixed on versatility.

AI-generated from the text of customer reviews

164 customers mention139 positive25 negative

Customers like the quality of the drill bits. They say it's very high quality, durable, and an excellent buy for quality drill bits that outlast any drill bits they have used in the past. Some customers also mention that the bits are great for dimpling high-quality stainless steel and are an amazing drill for stainless steel.

"Quality bits, stays sharper longer." Read more

"Works fine, but keep the tip lubricated or it will fail." Read more

"Only used for stainless bolts and they worked fine. Exceeded my expectations knowing that I would use them on stainless. Very reasonable purchase." Read more

"They were packed well. Exactly as described. Worked great." Read more

62 customers mention62 positive0 negative

Customers are satisfied with the value of the drill bit. They mention that it is durable, a great value for the money, and a quality product for their use and money. Some are also pleased with the performance and price.

"...Very reasonable purchase." Read more

"Quality product for my use and money. This is my second purchase from this company. Very satisfied." Read more

"...These are pretty good for the price...." Read more

"...They are well worth the money." Read more

31 customers mention31 positive0 negative

Customers are satisfied with the sharpness of the drill bits. They mention that they stay sharp for as long as any bit they have used before, and that they cut through steel very well. Some appreciate the simple bevel so there's no issue sharpening them.

"Quality bits, stays sharper longer." Read more

"Arrived fast, cut medium hardness steel and aluminum well" Read more

"Awesome bits love them sharp and durable set I would buy them again!" Read more

"Probably really is cobalt. Cuts through mild steel like it was butter. Lasts a long time." Read more

5 customers mention5 positive0 negative

Customers find the drill bits easy to use. They mention that they make relatively quick work of steel framing, cut into hardened bolts quickly, and proceeded to drill ten holes very easily. They are very good quality and noticeably harder than standard HSS bits, and go through stainless with ease.

"...They cut into the hardened bolts quickly and easily...." Read more

"These bits made relatively quick work of some steel framing inside my Winnebago rv. Good stuff! Way better than the cheap Ryobi set I tried at first...." Read more

"...As soon as these arrived I proceeded to drill ten holes very easily and the last hole cut as good as the first...." Read more

"...These are very good quality and noticeably harder than standard HSS bits...." Read more

5 customers mention5 positive0 negative

Customers are satisfied with the service provided by Amazon. They mention the drill bits are fast and grab quick.

"Arrived fast, cut medium hardness steel and aluminum well" Read more

"...Viola! Drilled right through, no problems. It was quick...." Read more

"...These bits with a bit of oil and they grab quick and cut straight." Read more

"A number one! Cuts through 304 like butter. Slow as you go!" Read more

36 customers mention23 positive13 negative

Customers are mixed about the versatility of the drill bits. Some mention that it drills through steel well, while others say that it didn't work well.

"...These bits immediately bit in and started drilling. I made all the necessary holes and the bits are still good for more work...." Read more

"...The original ones were not good for drilling holes in the flanges of T-posts...." Read more

"Drills through steel well which is what I bought them for. I burned through 3 big box store bits then I bought these...." Read more

"...Got these bits in and loaded one up in my drill. Viola! Drilled right through, no problems. It was quick...." Read more

11 customers mention3 positive8 negative

Customers are dissatisfied with the durability of the drill bits. They mention that they dull immediately when trying to drill out a broken screw and produce poor results.

"...So far I haven't broken any however they do tend to get dull at the tip after a few holes so I switch to a new one. Stainless is tough stuff...." Read more

"...Soft metal is fine, but they still dull quickly." Read more

"...stay sharp for as long as any bit I have used before and can be resharpened once dull...." Read more

"...They will shiver and dull before being near any steel or iron of any kind. Not even sure they come out of the package sharp at all...." Read more

Work well on hardened bolts
5 Stars
Work well on hardened bolts
I bought these for use with a jig for drilling holes for safety wire in bolt heads. They work great for this task.
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Top reviews from the United States

onhill 1
5.0 out of 5 stars Great product
Reviewed in the United States on April 19, 2024
Size: 9/32 inVerified Purchase
Quality bits, stays sharper longer.
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NewSmyrnaBch
5.0 out of 5 stars Use lots of oil
Reviewed in the United States on April 25, 2024
Size: 5/16 inVerified Purchase
Works fine, but keep the tip lubricated or it will fail.
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jim avery
4.0 out of 5 stars Product works fine
Reviewed in the United States on July 11, 2023
Size: 1/16 inVerified Purchase
Only used for stainless bolts and they worked fine. Exceeded my expectations knowing that I would use them on stainless. Very reasonable purchase.
One person found this helpful
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Philip Lebow
5.0 out of 5 stars Good hard drill bits in this fragile size
Reviewed in the United States on March 24, 2024
Size: 1/16 inVerified Purchase
Arrived fast, cut medium hardness steel and aluminum well
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greg
5.0 out of 5 stars High quality
Reviewed in the United States on April 5, 2024
Size: 3/16 inVerified Purchase
They were packed well. Exactly as described. Worked great.
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Gcx
5.0 out of 5 stars will itt spin and mar the serface?
Reviewed in the United States on April 11, 2024
Size: 1/4 inVerified Purchase
Some say yes, I say put a peace of blue masking tape where you are going to drill your hole, now this only needs to be done where surfaces can't be sanded... remove the tape when finish and make sure you are square to the surface you are drilling.
GC
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Kindle Customer
5.0 out of 5 stars Bits
Reviewed in the United States on May 4, 2024
Size: 5/16 inVerified Purchase
Awesome bits
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Robert tope
5.0 out of 5 stars I was surprised. They are very tough.
Reviewed in the United States on February 25, 2024
Size: 1/4 inVerified Purchase
Iam an electrician..and I drill a lot of holes all week. Every week.. some thought very thick steel. And these baby,s last ...on stainless. I use cutting oil.. low ram is key..also..
One person found this helpful
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Top reviews from other countries

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Josh Skaarup
5.0 out of 5 stars Worked perfectly
Reviewed in Canada on April 27, 2024
Size: 3/16 inVerified Purchase
I was having terrible luck with regular drill bits burning out while trying to drill pin holes in knife tangs. Got these, and they drill through with ease.
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Amazon Customer
5.0 out of 5 stars Bon
Reviewed in Canada on January 23, 2024
Size: 5/64 inVerified Purchase
Bonne qualité
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Tim Ashick
4.0 out of 5 stars good choice
Reviewed in Canada on July 13, 2019
Size: 1/8 inVerified Purchase
decent drills
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realchenardPEINTRE DEBOSSAGE
5.0 out of 5 stars BON ACHAT
Reviewed in Canada on November 19, 2023
Size: 3/32 inVerified Purchase
il perce tres bien
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Marc Moreau
5.0 out of 5 stars semble de bonne qualité
Reviewed in Canada on February 25, 2023
Size: 3/16 inVerified Purchase
utilisé pour percer plusieurs trous dans du stainless avec mon huile de coupe Walter la mèche performe très bien et est encore en parfaite condition. Oui je vais racheter ce produit.
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