-For unalloyed steel (e.g. structural steel), aluminium, plastic and wood -Suitable for standard drill presses (12.7 mm / ½“) -Carbon steel drill shank with HSS tip -3 pieces -Sizes: Ø 22 mm / Ø 24 mm / Ø 25 mm -Drilling depth max. : 33 / 36 / 37.5mm