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 Cobalt Drill Bit Set with Index Case – M35 Grade (5% Cobalt) Steel, 1.5mm to 6.5mm, Dual Twist Flute, 135° Split Point, Ideal for Hard Metals Like Stainless Steel and Cast Iron

13-Piece Cobalt Drill Bit Set with Index Case – M35 Grade (5% Cobalt) Steel, 1.5mm to 6.5mm, Dual Twist Flute, 135° Split Point, Ideal for Hard Metals Like Stainless Steel and Cast Iron

Product ID: 321471947

Details

Cutting angle string
135 Degrees
Cutting diameter
6.5
Finish type
Bronze
Material
Cobalt Steel
Shank type
Straight

🌀Dual twist flute for efficient chip removal

🎯135° split point for self-centering precision

⚙️M35 cobalt steel, Rockwell 67 hardness

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Description

🔧 Drill Like a Pro, Finish Like a Boss!

PRECISION EVERY TIME - 135° split point design eliminates walking, ensuring clean, accurate holes with less effort.
UNMATCHED DURABILITY - Crafted from M35 cobalt steel with 5% cobalt for up to 12x longer life than standard bits.
COMPLETE METRIC RANGE - 13-piece set from 1.5mm to 6.5mm covers all your metalworking needs in one sleek case.
PRO LEVEL PORTABILITY - Compact indexed case keeps your bits organized and ready for any job, anywhere.
SMOOTH FAST DRILLING - Dual twist flute optimizes chip removal, reducing heat and boosting cutting speed.

The Hymnorq 13-Piece Cobalt Drill Bit Set features premium M35 grade cobalt steel with 5% cobalt, delivering exceptional heat resistance and durability. Its 135° split point ensures self-centering precision, while the dual twist flute design enhances chip removal for faster, smoother drilling. With sizes from 1.5mm to 6.5mm neatly organized in a portable index case, this set is engineered for professionals tackling hard metals like stainless steel and cast iron.

Specifications

ASIN	B071ZRMWBN
ASIN	B071ZRMWBN
Best Sellers Rank	#35,492 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #20 in Jobber Drill Bits
Brand Name	HYMNORQ
Country Of Origin	China
Country of origin	China
Customer Reviews	4.4 4.4 out of 5 stars (2,318)
Customer reviews	4.4 4.4 out of 5 stars (2,318)
Cutting Angle String	135 Degrees
Cutting Diameter	6.5 Millimeters
Date First Available	13 December 2017
Finish Types	Bronze
Included Components	13 pieces of metric cobalt drill bits
Is Discontinued By Manufacturer	No
Item Dimensions	13 x 1.5 x 7 centimeters
Item Weight	0.1 Kilograms
Item model number	DC023
Manufacturer	Hymnorq
Manufacturer	Hymnorq
Material Type	Cobalt Steel
Model	DC023
Number of Flutes	2
Number of Pieces	13
Part Number	DC023
Point Style	Split Point
Product Dimensions	13 x 1.5 x 7.01 cm; 100 g
Set Name	13-Piece Cobalt Drill Bit Set
Shank Type	Straight
Surface Recommendation	Stainless Steel, Brass, Copper, Iron, Aluminum Alloy, Angle Steel, Cast Iron, Wood, Plastic
Tool Flute Type	Twist Flute
UPC	610521863130
Unit Count	1 Count

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₨27911

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In stock

Sold byAmazon Sri LankaDelivered 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 Sri Lanka.

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