High carbon steel twist drill with high speed steel tip and polished, dry rust resistant coating. Large diameter bits with reduced 12.5mm diameter shank enables use with standard chucks. Use on aluminium, steel, plastic, wood and non-ferrous metals. High carbon steel twist drill with high speed steel tip and polished, dry rust resistant coating. Large diameter bits with reduced 12.5mm diameter shank enables use with standard chucks. Use on aluminium, steel, plastic, wood and non-ferrous metals.