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 129 sockets in 3 color. This organizer for sockets is equipped with 36 1/2"inch dr clips ,45 3/8"inch dr clips and 48 1/4"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-o