Diamond screw punch - VA an innovative splitting punch with three cutting tips: punching waste is split into three parts! Suitable for stainless steel (VA), sheet steel (ST 37), plastic and aluminum Operation: Manual and hydraulic (We recommend the use of hydraulics.) Design: Punch, hole diameter 22.5 mm, material thickness 2.5 mm, nominal size PG 16, size 7/8', screw size 11.1x60.0 mm, pre-drill diameter 11.5 mm