Sunex SX221B 1/2-Inch Reversible Drill with Geared Chuck Planetary gearing for heavy duty use Reversible for added versat ility Positive action trigger for speed control Heavy duty side handle for added control Specificat ions: free speed (rpm) at 90psi 500, maximum capacity (-Inch) 1/2, air inlet (npt) 1/4, minimum hose size (i.d.) 3/8, recommended air pressure (psi) 90, avg. air consumption (cfm) 4, sound level (dba) 89, length (-Inch) 9.25, weight (lbs.) 4.5