Nylon Hollow Body Dart Clips provide a low cost way to assemble metal, plastic, composite, wood and other thin gauge materials. The center area of the prong on these Dart Clips has been completely hollowed out, making them open in the middle. This allows the prong to fully compress as it is snapped into the hole, and to expand back to its original shape for a secure fit. These clips are reusable, and are available in 13 sizes.