Heavy Duty ABS Plastic: Made with high-strength, anti-fatigue PP rails and impact-resistant ABS spring clips with anti-abrasion steel ball bearings. The ALOANES socket rail organizer set can hold and secure your sockets under heavy conditions and can withstand multiple, long-term socket insertions and removals. High Capacity: Holds up to 36 sockets in black. This organizer for sockets is equipped with 36 1/2-inch dr clips. Removable End Cap Design: Clips can be easily added or removed to meet your DIY needs for multiple sizes on a single rail. Also makes it easier for you to remove the clips to clean the socket rail organizer. Work with almost all brands of sockets. Can be used for deep and shallow socket storage, for metric and SAE(inch) sockets storage. Easy to store. 14 inches long. It can be easily hung on the wall, placed on your workbench, and placed in the tool drawer. You can even put it in your carry-on toolbox or tool bag.