The Crosby G-335 "Missing Link" Replacement Links are very popular because they offer nearly seamless chain repair. Just join the two sides together then peen the rivets, and just like that, you've repaired a broken leg of chain. Sizes 3/8" and bigger feature interlocking lugs. These links are suitable for use with low-grade chains used on the farm or around the house, but should not be used with Grade 70 or any lifting-grade chains.