The Air Hammer, No. SP-1410, from SP Air uses a hard steel cylinder and offers a free speed of 3,000 rpm. It features a quick change coil spring retainer for fast and easy chisel changes. Simply attach each chisel to remove rust from mufflers and pipes, cut body panels, and to peel off spot welds. The air hammer has a 0.4" shank size, measures 8.5" in overall length, weighs 3.6 lbs, and has a sound level of 96 dB. Also available in a kit (No. SP-1410K) that includes a sheet metal chisel, flat chisel, tapered punch chisel, and a spot welder chisel.