2pcs Delrin POM 8x40x10 mm U Type Groove Bearing Wheel BSU60840-10 8 mm Bore 40 mm Diameter Nylon Track Guide Roller Pulley

2pcs Delrin POM 8x40x10 mm U Type Groove Bearing Wheel BSU60840-10 8 mm Bore 40 mm Diameter Nylon Track Guide Roller Pulley

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