Invincible Step Drill, 0.1 - 0.8 Inch (4 - 20 Mm), 9 Steps, 6.35

(Ultra Hardness Material) HSS CO Cobalt High Speed Steel Step Drill is coated with TiAlN Titanium Nitride to achieve the hardness of HRC89. Improved high temperature and abrasion resistance of step drills Spiral Shape: The spiral groove design reduces pressure during cutting, improving the discharge of debris Compared to a straight line, it has excellent durability and excellent stability during rotation, and greatly improves the removal of debris and cooling efficiency Conical Drill for Stainless Steel: Spiral shape ideal for stainless steel. For drilling holes in stainless steel, thin iron plates, aluminum plates, wood, vinyl, resin, etc. It also be used to drill holes and chamfered at the same time, saving time Various Hole Diameters: 0.2 - 0.8 inches (4 - 20 mm), 9 stages (4, 6, 8, 10, 12, 14, 16, 18, 20 mm)), each hole is expanded sequentially from small to large hole, so you drill and enlarge, and modify various sizes (More Precision Design) Each step drill is engraved with millimeter precision to improve your work accuracy. Hexagonal axis duplex design makes the combination of step drill and electric drill more tight

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