Sign Post Driver, Product Type Sign Post Driver, Sign Post Drive Size 3 1/2 in, Blow Energy 81 ft-lb, Maximum Blows per Minute 1,500 bpm, Tool Length 32 in, Valve Location Valve on Tube, Pressure Port 9/16 in - 18 SAE O-Ring, Return Port 3/4 in - 16 SAE, Minimum Operating Pressure 1,500 psi, Maximum Operating Pressure 2,300 psi, Minimum Flow Rate 4 gpm, Maximum Flow Rate 6 gpm, Foot Width Not Applicable, Foot Length Not Applicable, Tool Series HPD, Features Dual Guide Handles