This TEKTON Socket Organizer Set is a universal socket organizer that securely holds 3/8 in. drive sockets and bit sockets. Rail capacity may vary based on individual socket diameters. Place sockets onto the clips to store them loosely, or twist them clockwise onto the clips to lock them in place. Detent bumps on the clip tabs engage with the socket to keep it secure, even when on-the-go. Sockets with only two detent grooves, such as impact sockets, will not engage with detent bumps on the tabs if placed incorrectly. Lock the rails into the tray with the keyhole slot. To release, press the button beside the keyhole latch and slide the rail out. The tray securely holds socket rails in an upright position, even through the opening and closing of tool chest drawers. Handles on either side of the tray make it easy to lift out of a drawer. Our rails and trays are molded from strong ABS polymer, providing stiffness and robust support for sockets. The clips are made from durable nylon polymer, designed to withstand frequent socket removal and chemical exposure. For large or heavy socket sets, we recommend fully supporting the rails and trays to prevent bowing.