Crimping Pliers Tool For Shock Cord & Hog Ring This tool is used for crimping hog rings around shock cord to allow you to create your very own shock cord assemblies. The jaws are cupped, and spring loaded so they will hold the clamp in place when you are crimping to make it easier and more efficient. The handles are coated in red rubber to aid grip while using the pliers. These are suitable for crimps of sizes 4mm, 6mm, 8mm & 10mm We supply the ring clamps, shock cord and hooks / ends so you can create your very own shock cord assemblies. Please note these have not been tested with upholstery hog rings and therefore we cannot guarantee this tool will work with upholstery. We only advise this tool to be used with shock cord. The red grips on these tools do have black marks in them down to manufacture process. We have tried to fairly reflect this in the images.