This set of 5 HSS twist drills with 1/4" hex shank KWB - 2 to 6 mm is suitable for use with all drills and screwdrivers fitted with a 1/4" bit. You'll be able to work in alloy and non-alloy steel, cast iron, malleable iron, sintered iron, non-ferrous metals and hard plastics. These drills have been precision-engineered to meet ISO 1173 standards. Diameters range from 2 to 6 mm. Benefits : Drills suitable for drills and screwdrivers with 1/4" bits Suitable for hard materials such as steel, cast iron and non-ferrous metals Drills supplied in practical storage box Features : Drill bit diameters: 2,3,4,5,6 mm Standard: ISO 1173 Weight: 100 g Ref. 421140 Packaging: Set of 5 HSS twist drills with 1/4" KWB hex shank - 2 to 6 mmDelivered in original packaging.