These Nylon Dart Clips with Slotted Legs provide a low cost way to assemble metal, plastic, composite, wood and other thin gauge materials. They are open at the end, and their legs are shaped to "lock" at the end for security. They easily compress as they are snapped into the mounting hole, and then expand back to their original shape, firmly securing assembled components. These clips are reusable, and are available in 5 sizes.