6Pcs 8×22.5×14.5mm U Groove Track Guide Bearing,(GCr15)Bearings SG22
mini pulley wheel rollerProduct Details1.Chromium Steel long-life bearings, smooth and low noise2.SG20 bearings are Sealed on both sides to keep lubricant in3.U Groove Bearing: I.D.=8mm, O.D.=22.5mm, Thickness=14.5mm, Groove width=10mm, Groove depth= 2.5mm.4.ABEC Tolerance 1 (P0), Z1 Noise Level for most general use5.U-type pulley bearing fits the rail track system. Widely used in door and window to track and drive mechanical equipment.