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