ZOS-6SF 6" Oil-Free Central-Vacuum Random Orbital Sander SPECIFICATION Specification Pad Size : 6(152) inch(mm) Free Speed : 12000 R.P.M. Avg. Air Cons. : 6(170) cfm(l/min) Operating Air Pressure : 90(6.2) PSI(bar) Net Weight : 0.85 kgs Air Inlet Size : 1/4 inch-NPT/PT Min. Hose Size : 3/8(10) inch(mm) Sound Pressure : 83 dB(A)