Needle and Chisel Scaler Kit Body Style - Air Tools In-Line Duty Cycle - Air Tools Industrial Duty Stroke Length 1 1/16 in Blows per Minute - Air Tools 4 000 Air Inlet Size - Air Tools 1/4 in NPT Average CFM @ 15 Second Run Time 6.5 CFM @ Full Load 13.0 Required Pressure 90 psi Min Hose Size 5/16 in Overall Length 9 in Shank 1/2 in Square Housing Lock Bayonet Needle Throttle Lever