... to punch,easy to operate. hole-punching machine:MHP-20voltage:220/110vwattage:830/900wmachine weight: 12kgsgross weight:20 ... /metal box /cardboard ctnuse for punch orifice on all kinds of steel plate or iron plate ,we offer die can punch ... die if you need to punch others shape of orifice.accessary with 4 sets round dies:8mm,12mm,16mm,20mm. hole-punching machine