INSTALL OR REPLACE DRAWER TRACK HARDWARE  Whether you are installing new drawers or repairing one that wont open or close properly, Prime-Line Drawer Slide Kit fits most bottom/side-mounted drawer systems. The drawer slide kit is constructed of steel tracks with a white powder coated finish and self-lubricating plastic rollers.  The smooth-gliding tracks in the Prime-Line R 7212 kit features a self-closing design that commences at the final 2-1/2 from the end of the 19-3/4 long tracks when closing. EASY TO INSTALL Installation is quick and easy. Installation instructions are included and also available on Prime-Lines website. 75 LBS MAX LOAD CAPACITY and is for use in 20 inch deep drawer cabinets. It features a positive stop in the closed position and a double stop in the extended position that locks your drawer open, so it cannot be pulled too far out and fall off the tracks. INSTALLATION TIP The clearance required between the drawer and the drawer opening for these slides is: 1/2 inch on left and right sides, 1/4 inch at the bottom and 5/8 inch at the top