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: with punch and die, tension screw with ball bearing. Hole diameter 63.5 mm, material thickness 3.0 mm, nominal metric dimension 63 mm, size 2-1/2', screw size 19.0x75.0 mm, pre-drill diameter 20.4*mm