Diamond screw punch 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 Suitable for: Sheet steel (ST 37), plastic and aluminum. Operation: Manual and hydraulic Design: With punch, die and ball bearing tension screw (encapsulated) Nominal size 16, hole 16.2 mm diameter, screw size 9.5 x 50.0 mm, pre-drill 10.0 mm, max. material thickness 2.0 mm