Kavo 635/637 CareFree Bearing

MiraLux High Speed Dental Bearings for Front or Rear  (Inner Race Extended for Rear)   Applications: 635B [rear only], 637B. [rear only] and Bella Torque Mini [rear only].CareFree design with less than .003" (.08mm) clearance between raceway and rolling elements keeps this bearing cleaner and free revving by sealing out debris. Rear Bearing:  Inner raceway is extended to .109" (2.78mm) if required for original chuck. Outer integral shield at .0937" (2.38mm). Radial 7-ball design, phenolic pre-greased ball retainer.