A disk cap typically sits around the outside of a patio furniture chair, patio furniture table or chaise lounge leg. Disk caps are usually very shallow, no more than ¼” deep. Disk caps were commonly used on very old wrought iron furniture that had a flat circular steel disk or washer, about the size of a silver half dollar, welded to the bottom of the leg. Chair Care Patio Furniture Repair has a large selection of patio furniture repair parts to fit a variety of outdoor patio furniture styles. Round patio chair glides and round chair leg disk caps fit older patio furniture chairs and chaises.To insure a proper fit, measure the diameter of the round flat disk welded to the bottom of your patio chair leg and compare to the dimensions of the patio furniture part dimensions shown below. The round disk will fit into the middle of the disk cap. You can find more information about how to measure for patio furniture replacement parts in the FAQ section of our website