Prime-Line R 7227 Rear Drawer Track Back Plate &ndash; Support and Maintain Alignment of Bottom/Side Mounted Drawer Glides, 5/16 in. x 7/8 in, Plastic, White, 1 Pair (1 LH, 1 RH) SUPPORT DRAWER GLIDES  These rear drawer track back plates are used to support side mounted drawer glides. DIMENSIONS - 5/16 in. wide x 7/8 in. tall x 3 in. deep openings. The 2-7/8 in. socket depth allows for front to back adjustment of the drawer slides. EASY INSTALLATION  Installation is quick and easy, and all fasteners are included. DURABLE  Constructed of a thick, durable white plastic, these rear drawer track brackets are designed to last. MAXIMUM LOAD RATING  The maximum load rating is 75 lbs. per pair. Verify dimensions against line drawing image before ordering