These rear drawer track brackets are constructed of a thick, durable plastic and they come in white, left and right-hand pair. They are designed to support and maintain alignment of bottom/side-mounted steel drawer slides (like Prime-Line parts R 7210 through R 7214). They feature an easy to install design, with a 2-7/8 inch socket depth to allow for front to back adjustment of the drawer slides. This pair of drawer track back plates includes the installation fasteners, and they have a maximum load rating of 75 lbs. per pair. These rear drawer replacement track sockets are simple to install and are used by many.