Step drill for drilling steel, non-ferrous metals, copper, brass, aluminium, plastics and wood. Made from hardened HSS 4241 steel with a titanium nitride coating. Nine diameter steps: 4, 6, 8, 10, 12, 14, 16, 18 and 20 mm. Two straight cutting flutes assist chip removal and heat dissipation. Features a 1/4" hex shank and a 118-degree point. Maximum material thickness: 4 mm. Diameter markings help control hole size; the stepped design also deburrs hole edges.
