Item Type: Step Drill Bit_x000D_Material: High speed steel_x000D_Uses: Drilling wood, stainless steel, plastic plates, copper plates, aluminum plates_x000D_Applicable Equipment: Electric drill, bench drill, battery drill, etc._x000D_Shank Type: General hex handleSize(approx.)Number of StepsBlade length per step(approx.)Shank diameter(approx.)Total length of cutter head(approx.)_x000D_4 ~ 20mm / 0.2 ~ 0.8in94.5mm / 0.2in6.35mm / 0.3in55mm / 2.2in 1One piece support multi?purpose, can drill holes of different diameters, open and ream, deburring, and accurate drilling 2X?shaped opening design effectively reduces drill bit slippage, adopt universal hex shank type 3Come with laser scale, the diameter is clear at a glance, the marking is very clear 4When machining round holes of different sizes on thin materials, no need to replace the drill bit, which saves time 5The product can drill wood, stainless steel, plastic plate, copper plate, aluminum plate1 x Step Drill Bit