Galvanized Triangle Hole Punches 1.thick:0.2-12mm 2.open area:10%-70% ... :0.5m-3m 4.shape:Round, Square Galvanized Triangle Hole Punches Punch Metal /Punched Metal/perforated metalMaterialCarbon steel, Aluminum, Brass, Copper ... winding-resisting, Ageing-resisting, flat and smooth surface, it is strong and serviceable.· Application: plate punching factory production network is widely ...