Replacement Bearing for Medicool Pro Power 30K & 35K Drill is not included. This is for a complete set of replacement bearings. Replace these bearings to have a smooth and quiet drill. In most cases it will even stop your drill from heating up if it happens to be a clogged bearing that you are having. Quantity: Complete Set of 4 Bearings & Carbon Motor Brush. Interested in a Repair? Please inquire with us as we do have a Repair Service for all Makes and Models of Drills.