Coved Spacers are molded in tough and resilient natural colored Nylon 6/6 plastic. Spacers fit a variety of tube diameters from 3/4″ dia. To 1-1/8″ dia., and have inside diameters from .218 to .375 for attachment screws. Coved Spacers are used for attaching parts to rods, tubes, or curved contours.