Air Angle Die Grinder, available collet in 1/8" and 1/4", free speed 20,000RPM... Free speed:20,000RPMAverage air consumption (25%): 4SCFMCollet: 1/8", 1/4"; 3mm, 6mmAngle: 90oExhaust: Rear 360oLength:165mmWeight: 0.50Kg, 1.10LbsAir pressure:90psi, 6.3kg/cm2Air inlet:1/4"