Screw punch round grooves, patented die, with side ejection for the waste piece. Hole punch version with 3 mm nose: For preventing push buttons and switches from twisting. Suitable for sheet steel (ST 37), plastic and aluminum. Operation: Manual and hydraulic. Design: With punch, die, ball bearing tension screw (encapsulated), lock nut and adapter for hydraulic operation. Storage: In a practical, sturdy plastic case. Nominal size Ø 22.5 mm with 3 mm nose, pre-drill Ø 14.0 mm, max. material thickness: 2.0 mm