1, with a dust cover or the outside ring of the bearing to prevent dirt from one side or both sides of the intrusion Highspeed Drill Bearings, greatly simplifying the bearing parts in sealing or lubrication of the structure. Washed into the dust cover with a thin steel plate, embedded in the outer tank, and the inner cylindrical surface of the composition of the gap seal. Ring to thin steel plate for the skeleton, rubber, plastic or felt seal lip and the inner ring fit, form contact seal. Dust simple manufacturing process, but poor seal. Ring seal is good, but there are additional friction. This Dental Bearing Manufacturers should be checked after installation dust cover or seal is loosened or translocation. Side of the lid or the ring of the bearing installation should pay attention to aspects. Both sides of the lid or the ring of the bearing inside the factory has been filled with grease, not immersed in oil before installation cleaning. Lubrication period is allowed without adding grease. 2, with no inner or outer ring of the bearing for the radial size restricted applications. Inner or outer ring by the journal or the corresponding holes on the surface of the seat replaced. Mainly needle bearings and cylindrical roller bearings of some type, because of their relatively easy processing raceway. As an alternative to the journal or seat ring hole to reach the surface due hardness, surface roughness and machining accuracy, and ensure the installation has the same interior space, so as to get the same capacity with the prototype. 3, with a positioning structure of the bearing outer ring with a groove as deep groove ball bearings, slot card is installed into an elastic ring, used to achieve the axial positioning of the bearing. And the outer ring with the end of the housing bore hole can be processed into straight, so reduce the size of the axial bearing area. With eccentric or with the top wire of the deep groove ball bearing with a eccentric or two set screws to the bearing inner ring fixed to the optical axis of an arbitrary position. Then with the easy axis and the bearing inner ring.