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. Design: punch.. Hole diameter 20.4 mm, material thickness 2.0 mm, nominal metric size 20 mm, nominal size PG 13, screw size 9.5x50.0 mm, pre-drill diameter 10.0 mm.