1/4" (6mm) AIR DIE GRINDER RP-17314 Light weight and easy to use. Great for high speed grinding, porting smoothing, general polishing and deburring. Used for all kind of mold, metal products and handicrafts. the manufacturing of circuit board, blank finishing, grinding finishing and soon. Model: Free Speed : 22000RPM Avg. Air Consumption : 4.5cfm (128.2L/min) Air Intel : 1/4’’ Sug. Air. Comp : 1.5HP Air Hose : 3/8"ID Overall Length : 180mm Net Weight: 0.54kg Packing : 20Pcs RP-17314 Grinder Cap : 1/4" Recommended air pressure 6.5KG/CM2(90 PSI)