4mm - 45mm HSS Cobalt Titanium Step Drill Bit

- High hardness step drill bit that can replace 15 individual drill bits. - High-speed steel HSS4241 with titanium coating to easily cut through steel, aluminum, copper, plastic, and wood. - Automatically deburr holes while drilling to keep the drill bit clean. - Double cutting blades and X-type openings design ensures a faster and smoother cutting. - 3-sided shank design prevents slip in drill chuck. - SIZES: 4mm, 6mm, 9mm, 12mm, 15mm, 18mm ,21mm, 24mm, 27mm, 30mm, 33mm, 36mm, 39mm, 42mm, 45mm. - 10mm handle.