... RPM 2)Forward/Reverse direction It has a powerful micro_motor hand piece light constructer of durable stainless steel,with sealed bearings that ... make it unbelievably smooth and quiet when operatin.With a speed of 25,000 R.P.M. made this model top ... .accessary: Micromotor.handpiece,power pack,rheostat, handpiece cradle, a pair of collet chuck wrenches. a coal available 2.25/3.0mm o sleeve chuck ...