Air Hammer, General Duty, Average CFM @ 15 Second Run Time 3.6, 13.5 CFM, Stroke 2 5/8 In, 3600 Blows per Minute, Min Hose 3/8 In, Air Inlet NPT 1/4 In, Required Pressure 90 PSI, Length 6 5/8 In, Shank Size 0.401 In, Round Shank Type, Pistol Handle, Includes 4 Chisels and Spring Retainer