Round screw punch BASIC suitable for: Sheet steel (ST 37), plastic and aluminum. Operation: Manual and hydraulic, punching waste is punched out in 1 part. Design: With punch, die and ball bearing tension screw with (encapsulated): Nominal size metric 20 mm, nominal size PG 13, hole diameter 20.4 mm, screw size 9.5x50.0 mm, pre-drill diameter 10.0 mm, max. material thickness 2.0 mm