Air Angle Die Grinder, available collet in 1/8" and 1/4", free speed 25,000RPM... Free speed:25,000RPMAverage air consumption (25%): 4SCFMCollet: 1/8", 1/4"; 3mm, 6mmExhaust: FrontLength:125mmWeight: 0.36Kg, 0.78LbsAir pressure:90psi, 6.3kg/cm2Air inlet:1/4"