Needle and Chisel Scaler Kit, Body Style - Air Tools In-Line, Duty Cycle - Air Tools General Duty, Stroke Length 1 13/64 in, Blows per Minute - Air Tools 4,800, Air Inlet Size - Air Tools 1/4 in NPT, Average CFM @ 15 Second Run Time 1.0, CFM @ Full Load 4.0, Required Pressure 90 psi, Min. Hose Size 3/8 in, Overall Length 18 in, Shank 1/2 in Square, Housing Lock Needle, Throttle Lever, Standards ISO-28927-9, For Use With Chisels; Needles, Includes 1 3/8 in Wide Chisel, (19) 1/8 in Steel Needles