Diamond screw punch, an innovative splitting punch with three cutting tips: Punching waste is split into three parts. Suitable for: Sheet steel (ST 37), plastic and aluminum. Operation: Manual and hydraulic. With punch, die, tension screw with ball bearing: Nominal size metric 12 mm, nominal size PG 7, size 1/2', hole diameter 12.5 mm, screw size 6.0x40.0 mm, pre-drill diameter 6.5 mm, max. material thickness 1.5 mm