... current ,overload and overheating situationRotating conversts positive and negativeHigh speed of 50,000 rmp,free maintenance of carboloy brush ... better torque and durabilityIt is very quiet,and the speed is highThe scope of application,is suitable for ... *165*82Mainframe:Speed :50,000RPMTorque:850 gf.cmWeight:290gSize:150*25*9mm dental handpiece/non-carbon teeth grinder/dental electric micro motor ...