Step Drill Bit Set for Metal,3 Groove Design M35 Cobalt Step Drill Bits (3/16"-7/8") Wear-Resistant AlTiN Coated, 1/4" Hex Shank Unibit for Carbon Steel, Stainless Steel, Wood, Plastic (1PC)

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• M35 COBALT HSS - For hard materials, M35 cobalt HSS is the way to go. With its high hardness and wear resistance, it's perfect for the toughest jobs. And thanks to proper heat treatment, it boasts higher toughness and bending strength than ordinary high-speed steel.

• AlTiN COATING - Our AlTiN coating is a cutting-edge material with exceptional properties, and is 50% longer life than TiAlN coating. It's extremely hard, can withstand high oxidation temperatures, and has excellent thermal hardness. Plus, it boasts strong adhesion, a low friction coefficient, and low thermal conductivity, making it an ideal choice for demanding applications.

• 3 GROOVE DESIGN - 3 spiral flutes ensure super fast, smooth and clean cutting. Spiral flute design with 12 different steps provides smooth and efficient drilling through a range of thicknesses without the need for multiple bits, making it a go-to tool for any project.

• HEAVY DUTY - Cuts holes on Stainless steel, Hardened Metal, Mild steel, Galvanized steel, Aluminum, Copper, Plastic, Wood, or anything that has similar or lower hardness as these materials. 3/16-7/8inch 12 Holes