... 4-Good quality All types of Deep Groove Ball bearings Bearing Features:1-High engine speed or limitting speed running2-High ... .(AISI)52100—American,(Din)100Cr6—Germany.4) Shield/closure: open bearing, Z, ZZ, RS, 2RS.5) Vibration and Noise level: Z1 ... .init( { 'aImgSrc': aBigImageSrc } ); } )(); all types Deep Groove Ball bearings,quality bearing