... lasting 4.ISO9001 certificate 5.Plenty of stock Hot Supply Ceramic Bearings 6001 6002 6003with High Quality! Features: 1, ... metric and inch deep groove ball bearing, self-aligning bearing, angular contact bearing, plain bearing, and spherical bearing. Open type, seal rings, ... than metal, so the change of clearance of full ceramic bearing is smaller than that of metal bearing.4. More resistance to ...