Are these good for make holes in steel material?

Yes，good for drilling steel.Generally, sellers purchase products from the market and sell them on e-commerce platforms. The STROTON drill bits we sell are designed and produced by our factory, including the case, which is unique on the market. This drill bit contains 6% cobalt, which is higher than general products. In addition, STROTON hss drill bits have a secret heat treatment recipe.So They’re good at drilling steel.

Where are these made?

They are made in China. They are very good cobalt drill bits set.It is designed and manufactured by STROTON, different from the similar products in the market.

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🔩 Drill Like a Pro, Last Like a Legend

VERSATILE 17 PIECE SET - Covers 1/16 to 1/2 inch for all your metal, wood, and plastic projects
COST EFFECTIVE LONGEVITY - Drill more holes with fewer bit changes—lowest cost per hole in its class
OPTIMIZED RPM GUIDELINES - Tailored speed recommendations ensure perfect stainless steel drilling every time
PRECISION SPLIT POINT TIP - Starts drilling instantly with zero walking for flawless accuracy
UNMATCHED HEAT WEAR RESISTANCE - 5% cobalt alloy keeps bits sharper, longer under intense conditions

The STROTON Cobalt Drill Bit Set features 17 precision-engineered bits made from premium 5% cobalt high-speed steel, delivering exceptional hardness (68 HRC) and heat resistance. Designed for professional-grade drilling through stainless steel, hardened metals, wood, and plastics, this set runs 2-3 times faster than standard bits, reducing wear and cost per hole. Its split point design prevents walking, ensuring clean, accurate starts, while detailed RPM guidelines optimize performance and tool life.

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Manufacturer	STROTON Ltd
Part number	Cobalt 6 series bits inch 1/16-1/2
Item Weight	516 g
Product Dimensions	18 x 13 x 4 cm; 516 g
Item model number	Cobalt 6 series bits inch 1/16-1/2
Size	1/16-1/2 in (17PCS)
Finish	High Speed Steel,Stainless Steel
Material	Cobalt
Item Package Quantity	1
Number Of Pieces	17
Measurement System	SAE
Batteries Included?	No
Batteries Required?	No

STROTON Cobalt Drill Bit Set (1/16-1/2 Inch, 17PCS), M35 High Speed Steel Twist Drill Bits for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood

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