Size: Approx. 23x21cm/9.06x8.27" Working Pressure: 90psi Free Speed: 23000rpm Air consumption 4.0cfm Air die grinder will accept all 1/4" and 1/8" shank burrs and grindstones Kit contains 10 mounted stones, 2 wrenches, 1/4" and 1/8" collets Includes 1/4" bayonet quick connect