UT9925 - Pistol Recoilless Air HammerErgonomically advanced low vibration and high frequeny design Reduced operator fatigue Precision engineered to reduce air consumption and increase reliability Compact design for increased access and comfort 0. 401" shank Bore (in.): 3 4" Stroke (in.): 2 1 2" Blows per Minute: 3700 Air Inlet (in.): 1 4" Hose ID (in.): 3 8" Bushing: 0. 401" Package Length: 8. 5 inches Package Height: 2 inches Package Width: 5 inches Package Weight: 4. 5 Lbs Country Of