Photo 1 of CNBTR 4PCS U-Type Pulley Wheel 0.31X1.77X0.45inches U Groove Bearing for Doors and Windows with Steel Bearings 8mm Shaft Hole 45mm

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Photo 1 of CNBTR 4PCS U-Type Pulley Wheel 0.31X1.77X0.45inches U Groove Bearing for Doors and Windows with Steel Bearings 8mm Shaft Hole 45mmPhoto 2 of CNBTR 4PCS U-Type Pulley Wheel 0.31X1.77X0.45inches U Groove Bearing for Doors and Windows with Steel Bearings 8mm Shaft Hole 45mm