The Mac Tools Long and Short Barrel Air Hammers are designated to be used for separating ball joints and tie-rod ends, break loose frozen parts, bushing removal in control arms and cutting applications including cutting tail pipes with curved surfaces and door panels. Each of the Long and Short Barrel Air Hammers achieves up to 40 percent more peak force per impact compared to the Mac Tools Air Hammer, No. AH2010. They each feature quick change bit retainers as well as anti-vibe technology for reduced vibration. In addition they each include a variable speed trigger for speed control and rubber handle grip for user comfort. The Short Barrel Air Hammer, No. MPH1931, is optimal for use in when speed is needed to complete light duty and auto body applications. It is 7.3" in length and weighs 4.6 lbs. It achieves 3,100 BPM, 3.2 CFM, and has a 2 1/3" stroke. As a kit, No. MPH1931K comes with a flat chisel, tapered punch, panel cutter, tail pipe cutter, undercoat scraper and a pouch. The Long Barrel Air Hammer, No. MPH1911, is optimal for use in when power is needed to complete demanding applications. It is 9.5" in length and weighs 5.4 lbs. It achieves 2,400 BPM, 2.6 CFM and has a 3 3/4" stroke. As a kit, No. MPH1911K comes with a flat chisel, tapered punch, panel cutter, tail pipe cutter hammer and a pouch.