Invincible 4- Step Drill, 0.1 - 0.9 Inches (4 - 22 Mm), 10 Steps,

(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 4- Step Drill: The 4- allows the to be evenly distributed and drilled close to a true circle. Compared to conventional double- blades, it distribute the load on a single for superior durability and cutting performance Conical Drill for Stainless Steel: Spiral shape is ideal for stainless steel and is used 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 - 0.9 inches (4 - 22 mm), 10 steps (4, 6, 8, 10, 12, 14, 16, 18, 20, 22 mm) are sequentially expanded from small holes to large holes, 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. The hexagonal axis duplex design makes the combination of step drill and electric drill more tight

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