UT Pneumatic Chipping Hammer, Bare Tool, 1700 bpm Blows per Minute, 1-1/8 in Bore, 4-1/4 in Stroke Length, 8.3 cfm Air Flow, 90 psi Air, 3/8 in Air Inlet, 1/2 in Minimum Hose, Oval Collar Retainer, Steel Housing Material, Ergonomic Handle, 109.4 dBA Sound Level, 16-1/2 in Overall Length.