Rockdrill Weight Class 50 lb Shank Size 1 in x 4 1/4 in Maximum Blows per Minute 2 300 bpm Piston Bore Size 3 in Piston Stroke Length 2 in Retainer Type Latch Vibration Reducing Handles No Sound Reducing Muffler Yes Air Inlet Gender Male Air Inlet Size 3/4 in Air Inlet Type NPT Air Consumption 120 cfm For Use On Rock Hex Shank Size 1 in x 4 1/4 in Hole Depth 16 ft Hole Diameter 2 in Maximum Hole Depth 16 ft Maximum Hole Diameter 2 in Minimum Hose Size 3/4 in