ultra thin bearing:1,ABEC7 2,High speed 3,End cover: ... ,RS 4,Noise level:Z1,Z2 5,C2,C0,C3.. ultra thin bearing Features : Very light weight & very thin sectionsWide range ... mm) BoreAvailable as standard in 52100 (100Cr6) and stainless steelFour precision classes from ABEC 1F to ABEC 7FThese sizes available in ... PTFE, Buna-N-Rubber (contact and light contact). High Performance ultra thin bearing