HP4540 Suitable for use with cutters, punches, spot weld breakers and flat chisels. Supplied with retainer spring. Accepts all standard 0.401” shank tools, 1/4” NPT air inlet thread for 10mm air hose, 90psi air pressure, 4cfm* air consumption. Noise Level: 112dBA Sound Power: 121dBA Vibration: 15.5m/s Stroke length: 40mm. Overall length: 145mm. *Based on a 15 second cycle per minute average use.