aluminium alloy material, light weight with strong punch force Punch force: 70KNStroke:25mmPackage: plastic boxWeight of box:1.20kgAccessories:Round knockout punches type D:22.5,28.3,34.6,43.2,49.6,61.5mm7/16"x3/4" draw stud:1pc3/4"x3/4" draw stud:1pcSpacer:1pcSealing kit:1setPlastic box:1pc INSTRUCTION OF OPERATION: Punch hole below 3.5mm mild steel.