Klutch Air Hammer 5in. Drift Set - 4-Pc. For removal of stuck bolts,strut pins and more Made of chrome molybdenum steel for added durability 5inL parallel shaft design won't get stuck in deep holes Includes 6mm to 15/64in, 8mm to 5/16in, 10mm to 3/8in, 12mm to 1/2in air hammer drills