... for insert bearings, steel, plastic, aluminum housing units 3) Bearing series: UC, RB, SB, SA, UE, HC, UK, UCP, UCF, UCFL ... , SBPF, SAPF, SBPFL, SAPFL, SBPFT, SAPFT, SER, AEL, CSA, other series 4) Automatic aligning, repeated lubrication, dustproof, sealed, convenient installation and disassembly