Feature: 1. ENHANCE HARDNESS AND DURABILITY: The drill bit is plated with Ti to enhance the hardness and durability, which is convenient and useful 2. CHAMFERING FUNCTION: Full size from 4~32mm, with chamfering function, bring more powerful drilling, practical and convenient 3. DOUBLE CHIP REMOVAL BRING FASTER PUNCHING: Hex universal mouth does not slip, double chip removal bring faster punching, possess higher efficiency 4. HIGH SPEED STEEL MATERIAL: Adopt good quality high speed steel material, possess high hardness, stable performance, of sharpness and durable 5. MATERIAL CUTTING AND PUNCHING: Used for material cutting and punching, cutting diameter from 4mm~32mm, shank diameter is 6.35mm Specification: Item Type: Step Drill Bit Material: High speed steel Purpose: Material cutting and punching Cutting Diameter: Approx. 4 ~ 32mm / 0.16 ~ 1.26in Shank Diameter: Approx. 6.35mm / 0.25in Cooling Type: External cooling Outer Edge Angle: 118° Process: Ti plated drill bit Applicable Materials: Part of pig iron, copper, aluminum, wood, PVC, plastic, etc. . Package List: 1 x Step Drill Bit