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Deep groove ball bearings, fashionable, slide flexible, compression wear. Suitable for furniture hardware accessories, garage door pulley , mobile doors, glass sliding doors, aluminum doors and w This u groove pulley is made of Reinforced nylon + bearing steel. 5pcs U Groove Wheels are ideal DIY gadgets for you to build the camera track system and also can replace the wheels on the dolly that use skate/skateboard wheels with a 6mm center bore. Product Size: 6mm(ID)*30mm(OD)*13mm(Thickness),5 PCS