Item Type: Step Drill Bit Material: High speed steel Uses: Drilling wood, stainless steel, plastic plates, copper plates, aluminum plates Applicable Equipment: Electric drill, bench drill, battery drill, etc. Shank Type: General hex handle Size(approx.)Number of StepsBlade length per step(approx.)Shank diameter(approx.)Total length of cutter head(approx.) 4 ~ 12mm / 0.2 ~ 0.5in 57mm / 0.3in6.35mm / 0.3in43mm / 1.7in1One piece for multi-purpose, can drill holes of different diameters, open and ream, deburring, and accurate drilling 2X-shaped opening design effectively reduces drill bit slippage, universal hex shank type 3Laser scale, the diameter is clear at a glance, the marking is very clear 4When machining round holes of different sizes on thin materials, there is no need to replace the drill bit, which saves time 5Can drill wood, stainless steel, plastic plate, copper plate, aluminum plate 1 x Step Drill Bit