Voltage:220v Power:830w Punch hole size:6-20 mm Punch steel thickness:0-6mm Punch speed:2-3 s Applied for punching on steel,iron plate,copper plate,aluminum plate,U-steel,I-steelPortable,small size and easy to handle and effor-savingTechnical Specification WHP-20 hydraulic hole pucher punch hole size 6-20mm