... 2.Max.thickness:6mm 3.Package:steel box Electric Hydraulic Puncher MHP-20 Voltage 220/110VNo-load power 830/900WPunch speed ... plate, copper plate,aluminum plate,U-steel,I-steel etc.Portable,small,easy to operate, saving power and quick to punch ... Feel Free to Contact us at Your Convenience. Electric Hydraulic Puncher MHP-20