FORMUFIT F114CF7-WH-4 Caster Fitting Insert, Furniture Grade, 1-1/4" Size, White (Pack of 4) This product will fit inside of 1-1/4" Size PVC fittings, which have an inside diameter of 1.660" (1-5/8") Superior, glossy white surface finish for a Professional appearance Manufactured in the USA from durable and UV-resistant Furniture Grade PVC. Accepts threaded casters, or can accept a 3/8" rod for axles.