Air Hammer Kit, Standard Duty, 3 1/2 in Stroke L, 2,000 blows/min, w/5 ChiselsAccurate and easily controlled tease throttleStandard beehive retainer - allows use of a wide variety of accessoriesModel 772 - Unitized "easy-out" throttle valve assemblyFurnished with two retainers for use with a wide variety of accessories