Square head screw hole punch, diameter 29 mm hardened steel and brass washer against corrosion. Perfectly smooth edges for a perfect finish Cutting capacity: 2mm for metal sheet and 1.2mm for stainless steel A: 42mm Thread: M12 x 1.50mm Part Number: PI-71029 Cutter: Piher 71029 Square Head Screw Hole Punch Diameter 29 mm Type: