General description A 18.0mm large diameter HSS blacksmith drill bit with a 1/2" reduced shank, ideal for use on hard and soft metals. Technical specifications Diameter: 18.0mm Shank: 1/2" reduced Material: High speed steel Standard: DIN 338 Usage Suitable for applications including: steel cast & malleable iron non-ferrous metals Other information Part of a range of HSS large diameter blacksmith drill bits in metric sizes from 14.0mm - 25.0mm (Part Nos. 33000 - 33006)