Preamer 2 PCS 50mm U Groove Nylon Ball Bearing Guide Pulley Wheels Roller Pulleys for Lifting for 6, 8,10mm Rope, 608zz Bearing Deep groove ball bearings, fashionable, slide flexible, compression wear. Suitable for furniture hardware accessories, mobile doors, glass sliding doors, aluminum doors and w Product Size: 8mm(ID)*50mm(OD)*12mm(Thickness), Set of 2 pics !