1/4" Heavy Duty Air Hyraulic Powered Rivet Gun, Comes equipped with: 1/4", 7/32", 3/16", 5/32", 1/8", & 3/32" nosepieces. 1/4" Air inlet. Air consumption 4 cfm. Requires only 75-85 PSI for operation. Quick release air valve permits quick cylinder return. Ideal for automotive body repair, metalworking shops, and mobile home builders.