1/4" Air Die Grinder Item No. Overall Length Pack KGS 771-905 178 mm 1 0.6 Revoluation Per Minte : 22,000 Collect Size : 1/4" (6mm), 1/8" (3mm) Air Consumption : 3.5 cfm Min. Hose Size : 3/8" Noise Level : 80 dbA Air Inlet Thread Size : 1/4" NPT