Can these drill bits cut through hardened steel or stainless steel?

Yes. M35 grade steel with 5% Cobalt is specifically engineered for high-tensile metals like stainless steel, cast iron, and titanium alloys. For fully hardened steel (HRC > 50), carbide bits are recommended.

Will these bits fit my standard cordless drill?

Yes. These feature standard round straight shanks. The largest diameter is 10mm, allowing them to fit securely into any standard 3/8-inch (10mm) or 1/2-inch (13mm) drill chuck.

Do I need to use cutting oil or lubricant?

Highly recommended. While Cobalt is heat-resistant, using cutting fluid significantly reduces friction and heat buildup. This prevents the bit from annealing (softening) and greatly extends its lifespan.

Do these bits require a center punch to start?

No. These bits feature a 135° Split Point tip. This design is self-centering and cuts immediately upon contact with the metal, preventing the bit from "walking" or skating across the surface.

Are these bits just coated with Cobalt or solid?

They are solid M35 Cobalt steel throughout, not just coated. Unlike titanium-coated bits that lose effectiveness once sharpened, these maintain their heat resistance and performance even after resharpening.

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15-Piece M35 Cobalt Drill Bit Set, Metric 1.5 to 10mm, 5% Cobalt HSS for Drilling Hard Metal Stainless Steel Cast Iron, Fully Ground Jobber Length Bits with 135° Split Point Tough Indexed Case

15-Piece M35 Cobalt Drill Bit Set, Metric 1.5 to 10mm, 5% Cobalt HSS for Drilling Hard Metal Stainless Steel Cast Iron, Fully Ground Jobber Length Bits with 135° Split Point Tough Indexed Case

Product ID: 86329568

Details

Cutting angle string
135 Degrees
Cutting diameter
10 Millimetres
Finish type
Bronze
Material
Cobalt Steel
Shank type
Straight

📐135° split point for precision starts

⚙️5% Cobalt HSS for extreme heat resistance

🛠️15-piece metric set covers 1.5-10mm

$75.52

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Description

🛠️ Drill Smarter, Not Harder — Own the Toughest Jobs with Confidence!

VERSATILE METRIC RANGE - 15 essential sizes from 1.5mm to 10mm cover all your metalworking, automotive, and DIY needs.
PINPOINT ACCURACY EVERY TIME - 135° self-centering split point eliminates walking—no pilot hole needed for flawless starts.
RUGGED ORGANIZED READY TO GO - Heavy-duty indexed ABS case with rubberized corners keeps your bits secure and easy to find on any job site.
ENGINEERED FOR PRECISION SPEED - Fully ground jobber length bits with dual-flute design ensure rapid chip removal and cooler drilling.
CUT THROUGH TOUGH METALS LIKE A PRO - M35 cobalt steel with 5% cobalt boosts heat resistance and durability for stainless steel, cast iron, and titanium drilling.

The Hymnorq 15-Piece M35 Cobalt Drill Bit Set features premium 5% cobalt high-speed steel bits designed for superior heat resistance and durability. With a precision 135° split point and fully ground jobber length design, these bits deliver accurate, clean holes in hard metals like stainless steel and cast iron. The comprehensive metric set (1.5-10mm) comes housed in a rugged, impact-resistant case, making it the ultimate toolkit for professionals and serious DIYers tackling demanding metal drilling tasks.

Specifications

ASIN	B07B7L6WVY
Best Sellers Rank	914,557 in DIY & Tools ( See Top 100 in DIY & Tools ) 1,439 in Jobber Drill Bits
Brand	Hymnorq
Customer Reviews	4.4 out of 5 stars 2,451 Reviews
Cutting Angle String	135 Degrees
Cutting Diameter	10 Millimetres
Cutting angle string	135 Degrees
Cutting diameter	10 Millimetres
Finish Types	Bronze
Finish type	Bronze
Included Components	15 pieces of metric cobalt drill bits
Item Dimensions	15 x 11 x 4 centimetres
Manufacturer	Hymnorq
Manufacturer Part Number	B07B7L6WVY
Material	Cobalt Steel
Minimum Bore Diameter	1.5 Millimetres
Model Number	B07B7L6WVY
Number of Flutes	2
Number of Pieces	15
Point Style	Split Point
Set Name	15PC Set
Shank Type	Straight
Shank type	Straight
Surface Recommendation	Metal
Tool Flute Type	Spiral
UPC	666389162076
Unit Count	1.0 count

Reviews

J**N

Migiwata 15 Piece Metric M35 Cobalt HSS Drill Bit Ki

This is the best drill bit for drilling out stainless steel screw which is very hard metal. Do not buy the titanium coated for hard steel they go blunt in second.

3.01.2019

R**D

Nice drill bits

Just what i was looking for to drill into stainless steel..!

23.05.2019

K**T

do not cut well.

did not cut well on old uk steel and did not las. Very disappointing performance.

2.04.2019

D**D

Would highly recommend this product.

High quality products great price.

14.03.2020

H**M

These eat through the metal 👌

These drill bits are fantastic for drilling through the metal so we could put the new metal legs on our outdoor couch

30.01.2026

M**C

quarter of the price and quality is great

13.01.2024

L**C

Qualité correcte

Si j'avais payé le double je serais faché mais bon, pour ce prix, ca me va. Le controle de qualité est plus ou moins efficace mais j'ai un Drill Doctor au pire aller je vais leur donner un petit coup sur la meule. Sinon je n'ai aucunement vérifié l'efficacité ni même le diamètre encore. Le temps me dira

1.02.2023

S**Y

It works!

These drill bits actually work! Drill through car roof rail like hot knife through butter

15.03.2025

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$75.52

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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2 weeks ago

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