16 in. Soft Close Full Extension Side Mount Ball Bearing Drawer Slide with Installation Screws (10-Pair)The rails are made from cold rolled steel, in zinc, and have precision steel ball bearings. 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. Soft close features: Whether large or small, heavy or light, soft closing action keeps drawers from slamming closed. It adapts to various closing speeds and features overload