Set of four sockets. Fits casters with a 7/16-inch Grip-Ring Stem up to 1 1/4-inch long Also fits Miracle Casters Mounts on the side of furniture (like a desk) along the bottom edge. Click alternate image to see dimensions. The caster sockets featured on this page work with Miracle Casters (and other casters that have a 7/16-in. diameter grip-ring stem.). These sockets allow casters to be mounted to furniture other than chairs, or to chairs that do not have a suitable socket. Now, desks, TV caddies, bar-stools and even home-made furnishings can be fitted with casters. Select the socket design that will work best with your particular type of furniture. (We sell other sockets in separate listings.) Some chairs and certain types of furniture may not be suitable for use with any of the sockets featured here. There is always a risk that modifying furniture by adding sockets or casters may lead to furniture damage or personal injury. Use these sockets at your own risk. Side Bracket Sockets are designed to mount to a flat surface like the side of a desk (along the bottom edge). Use screws or bolts to attach (not included). Unplated steel. Click alternate image to see dimensions.