FAW-P0048-3: 3/8" HEAVY DUTY AIR IMPACT WRENCH; TWIN HAMMER SQUARE DR:3/8";BOLT SIZE:7/16" FREE SPEED:9,500 RPM MAX.TORQUE:200 ft-lb(271 N-m) VIBRATION:9 m/sec FAW-P0048-4: 1/2" HEAVY DUTY AIR IMPACT WRENCH; TWIN HAMMER SQUARE DR:1/2";BOLT SIZE:7/16" FREE SPEED:9,500 RPM MAX.TORQUE:190 ft-lb(258 N-m) VIBRATION:9 m/sec