Designed for use with high speed cordless drills. Produced from custom-engineered steel with black oxide coating for up to 4 x longer life. Each step is relief-ground to drill and deburr automatically. Rapid Strike tip improves centering to allow fast drilling without the need to punch. Optimised 2-flute, ground, sharpened edge geometry provides fast and smooth cutting. Secure 3-flat grip prevents step drill from slipping in the chuck and ensures maximum transmission of torque. Also features laser-engraved size markings for best long term visibility. Ideal for drilling into ferrous and non-ferrous sheet metals, profiles and pipes; copper, brass and aluminium; stainless steel and plastics. Maximum material thickness 4mm. Use of a coolant recommended. Steel Straight Shank 4 - 35mm Dia. Drill Bit Suitable for Stainless Steel, Steel, Cast Iron, Wood & Aluminium Alloy Steel Spot Drill, Drill & Debur Steel Straight Shank 4 - 35mm Dia. Drill Bit Suitable for Stainless Steel, Steel, Cast Ir...