1/4" (6mm) AIR DIE GRINDER RP-27313 Lightweight aluminum body. Safety lever prevents accidental starts. Rear exhaust. It can be used with all types of accessories for porting, weld breaking, and smoothing sharp edges, as well as deburring, polishing, and grinding. Model: No Load Speed : 25000RPM Overall Length : 157mm Air Intel : 1/4" Working Pressure : 0.63MPA Air Hose : 3/8"ID Weigh : 0.35kg Avg. Air Consumption : 3cfm (85.5L/min) Packing : 20Pcs RP-27313 Grinder Cap : 1/4" Recommended air pressure 6.5KG/CM2(90 PSI)