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 handle_x000D_Size(Approx. )Step numberBlade length per step(Approx. )Shank diameter(Approx. )Total length of cutter head(Approx. )_x000D_4 ~ 12mm / 0.2 ~ 0.5in 57mm / 0.3in6.35mm / 0.3in43mm / 1.7in_x000D_4 ~ 20mm / 0.2 ~ 0.8in 94.5mm / 0.2in6.35mm / 0.3in55mm / 2.2in_x000D_4 ~ 22mm / 0.2 ~ 0.9in 104mm / 0.2in6.35mm / 0.3in55mm / 2.2in_x000D_4 ~ 32mm / 0.2 ~ 1.3in 154mm / 0.2in6.35mm / 0.3in78mm / 3.1in 1Multi?purpose, can drill holes of different diameters, simple and convenient operation 2Accurate drilling, the product can be rounded, reamed, and deburred, suitable for hand drills, bench drills and battery drills, etc. 3With X?shaped opening design, it can effectively reduce drill bit slippage and easy to operate 4The product has a scale, the diameter can be seen intuitively, and the marking is clear 5The step drill bit is suitable for drilling wood, stainless steel, plastic plates, copper plates and aluminum plates1 xStep Drill Bit