Maxworks 60156 190-mm Air Hammer Stroke Length: 2-9/32-Inch Blows per minute: 3000; Bore Diameter: 3/4-Inch Air Consumption: 5.5 CFM Maximum air pressure: 90 PSI; Standard 1/4-Inch air inlet Minimum hose size: 3/8-Inch diameter. Includes 5 chisel attachments