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 28.3 mm, material thickness 3.5 mm, nominal size PG 21, screw size 19.0x55.0 mm, pre-drill diameter 20.4*mm