Air Backfill Tamper, Hole Diameter 5 3/4 in, Piston Bore Size 1 5/8 in, Piston Stroke Length 4 in, Maximum Blows per Minute 1,550 bpm, Butt Diameter 5 3/4 in, Tool Weight 35 lb, Air Inlet Gender Female, Air Inlet Size NPT, Air Consumption 29 cfm, Air Inlet Type 3/8 in NPT Female, Duty Heavy, Handle Type Straight, Minimum Hose Size 1/2 in, Primary Material Application Concrete, Product Type Backfill Tamper, Series 341A2M Series, Sound Level 91.9 dBA, Standards ISO 15744, ISO 28927 WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov -