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Product Size: 6mm(ID)x30mm(OD)x13mm(Thickness), 5 pcs 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. Suitable for furniture hardware accessories, garage door pulleys, mobile doors, glass sliding doors, aluminum doors, etc. This u-groove pulley is made of Reinforced nylon + bearing steel. Deep groove ball bearings, fashionable, slide flexible, compression wear.