21 in. Soft Close Full Extension Under Mount Cabinet Drawer Slide 100 lbs. (1-Pair)Full extension slides also telescope. Allowing the full length of the drawer to clear the cabinet. Choose these when you need easy access to the rear of the drawer, as in a file drawer. High load rating allows you to install those slides on any type of drawer. Package content: 1 pair 21 in. under mount drawer slide, 1 pair locking device, 1 pair plastic rear bracket and installation screws Whether large or small, heavy or light, soft closing action