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 6.5mm, 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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13-Piece M35 Cobalt Drill Bit Set, Metric Sizes 1.5mm to 6.5mm, 5% Cobalt HSS for Stainless Steel, Cast Iron & Hard Metal, Fully Ground 135° Split Point with Storage Case

13-Piece M35 Cobalt Drill Bit Set, Metric Sizes 1.5mm to 6.5mm, 5% Cobalt HSS for Stainless Steel, Cast Iron & Hard Metal, Fully Ground 135° Split Point with Storage Case

Product ID: 45689374

Details

Cutting Angle String
135 Degrees
Cutting Diameter
1.5 2 2.5 3 4
Finish Type
Bronze
Material
Cobalt Steel
Shank Type
Straight

🎯135° split point - self-centering precision

🧰13 metric sizes - versatile kit

⚙️5% Cobalt M35 HSS - ultra durable

$28.96

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Description

🔩 Drill Like a Pro, Finish Like a Boss!

ORGANIZED PORTABLE - Durable labeled case with tilt-out holder keeps your bits perfectly sorted and ready for any job site.
UNMATCHED DURABILITY - M35 cobalt steel alloy delivers up to 67 Rockwell hardness for long-lasting performance on tough metals.
VERSATILE METRIC RANGE - 13 carefully selected sizes from 1.5mm to 6.5mm cover all your precision drilling needs.
EFFORTLESS CHIP EJECTION - Dual twist flute design rapidly clears debris, reducing heat and extending bit life during heavy use.
PRECISION AT FIRST CONTACT - Fully ground 135° split point ensures zero walking and faster, cleaner starts every time.

The Hymnorq 13-Piece M35 Cobalt Drill Bit Set features premium 5% cobalt high-speed steel for superior heat resistance and durability. Its fully ground 135° split point design self-centers to prevent walking, enabling faster, more accurate drilling through stainless steel, cast iron, and other hard metals. With 13 metric sizes and a smart storage case, this set is engineered for precision, efficiency, and professional-grade performance.

Specifications

ASIN	B071ZRMWBN
Best Sellers Rank	#33,612 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #11 in Metalworking & Multipurpose Drill Sets
Brand Name	HYMNORQ
Customer Reviews	4.4 4.4 out of 5 stars (2,539)
Cutting Angle String	135 Degrees
Cutting Diameter	1.5, 2, 2.5, 3, 3.2, 3.5, 4, 4.5, 4.8, 5, 5.5, 6, 6.5 Millimeters
Finish Types	Bronze
Included Components	13 pieces of metric cobalt drill bits
Item Dimensions	5.12 x 0.59 x 2.76 inches
Item Weight	0.1 Kilograms
Manufacturer	Hymnorq
Material Type	Cobalt Steel
Model	DC023
Number of Flutes	2
Number of Pieces	13
Part Number	DC023
Point Style	Split Point
Set Name	13pcs(Plastic Case)
Shank Type	Straight
Surface Recommendation	Stainless Steel, Brass, Copper, Iron, Aluminum Alloy, Angle Steel, Cast Iron, Wood, Plastic
Tool Flute Type	Spiral
UPC	610521863130
Unit Count	1.0 Count
Warranty Description	Seller warranty for 90 days from date of purchase.

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$28.96

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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Fantastic experience overall. Will recommend to friends and family.

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The product quality is outstanding. Exactly what I needed for my work.

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