5x 8x30x10mm Nylon Round Pulley U Groove Track Roller Bearing Pulley Wheel, Double Shielde 608zz Bearing Inside

Preamer 5PCS 8x30x10mm Nylon Round Plasic Pulley U Groove Track Roller Bearing Pulleys Wheel Roller for Sliding Door Window Lifting Systems, Double Shielde 608zz Bearing Inside

uxcell 4pcs U Type Groove Pulley Nylon Guide Rolling Bearing 5x25.5x8.5mm U Groove Roller Wheel for Door Window, Blue

uxcell U608ZZ 608 Nylon U Groove Bearings 8x30x10mm Double Metal Shielded (GCr15) Chrome Steel Ball Bearings 10pcs