All Things Garage 90120 2x4basics Shelflink &ndash; Single, Black Single shelf link to be used in configuration with as many other 2x4basics shelflinks as you need to create your ideal shelving unit, customized to your space and shelving needs Made of durable, maintenance-free heavy-gauge structural resin, shelflinks are built to last  2x4s not included Once joined with 2x4s, each shelf can support spans up to 8 feet and hold up to 1000 pounds Includes one black-colored shelf link, all necessary hardware, and easy-to-follow instructions included  simple assembly is required. Lumber and tools not included. Only straight, 90 cuts are required, with no miters or angles