The Rockwood Air Hammer and Chisel Set features a high-performance 4500 bpm (blows per minute) design for quick and efficient operation. 4,500 Blows Per Minute Includes 4 popular bit configurations Requires only 4CFM @ 90 PSI of air Accepts standard 0.401\" Parker Taper Shanks It accepts any standard 0.401\" Parker Taper shank air hammer tool bit and includes four of the most popular tool bit configurations. Contents: (1) Air Hammer (1) Retaining Spring (1) Taper Punch (1) Sheet Metal Cutter (1) Sheet Metal Trimmer (1) Flat Chisel (1) 1/4\" MNPT, Male quick disconnect inlet fitting Specifications: Shank Capacity: Standard 0.401\" Parker Taper BPM: 4,500 free speed Air Consumption: 4 CFM @ 90 PSI Max. Operating Air Pressure: 90 PSI Inlet Thread Size: 1/4\" FNPT