1)Silence air die grinder. 2)have two bearing 3)british type collet Features:*grinder lightweight aluminum housing*lever lock throttle for safety*built-in regulator*used with a variety of accessories for weld breaking,smoothing sharp edges,deburring,polishing and grinding*rear exhaust Specifications:*collect size~1/4"(4mm)*free speed:25000~22000r/min*air inlet size~1/4"*working pressure~6-8kgs/cm2*air consumption~115L/min,4cfm 

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