Portable electro-hydraulic punch with 16.9 tons of punching pressure can quickly punch through 3/8" materials in 2.5 seconds. Easily confirm the hole position with the jog down feature. Punch automatically returns to the starting position after the punching cycle is complete. If punch ever resists returning to the home position, squeeze the trigger for power feed return. The 75004PR is a self contained unit that only requires electrical power.