Item Type: Reduced Shank Drill Bits_x000D_ Product Material: High speed steel_x000D_ Blade Diameter: Approx. 21.5mm / 0.85in_x000D_ Shank Diameter: 1/2in(12.7mm)_x000D_ Drill Bit Total Length: Approx. 150mm / 5.91in_x000D_ Uses: Suitable for iron, aluminum, copper, stainless steel, high speed steel, manganese steel, various quenched steel parts 1HIGH DRILLING EFFICIENCY: Spiral chip removal design, bring smooth chip removal. Smooth and of sharpness grooves support fast cutting and high drilling efficiency 2OF SHARPNESS AND DURABLE: High quality high speed steel material, possess high hardness, stable performance, of sharpness and durable 3118 ACUTE ANGLE: 118 acute angle design, bring fast and accurate drilling, saving time and effort, suitable for processing metal metals 4MEET DIFFERENT CUTTING ACCURACY: The cutting edge is finely sharpened to meet different cutting accuracy, with high work efficiency 5FOR VARIOUS METAL MATERIALS: Suitable for iron, aluminum, copper, stainless steel, high speed steel, manganese steel, various hardened steel parts1 x Reduced Shank Drill Bits