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Step drill bits cut and enlarge round holes in sheet metal, plastic and other thin materials, with each step giving a different size, so one cone drill bit can stand in for several twist drills. Single bits cover 4-30mm in HSS cobalt, 4-42mm in HSS steel, 6-30mm for metal, plastic and wood, 6-40.5mm with a TiN coating for sheet metal and a large 6-60mm cone with a 13mm shank.

Step drill bit sets include a 3pc titanium coated set with hex shanks, a 3pc set of 4-32mm bits for metal and a 3pc set with 4-20mm and 5-35mm bits plus an auto centre punch. Each bit works as a cone hole cutter, so you can stop at the exact size you need. Drill at a steady, moderate speed and use cutting fluid on steel.