10 MM Quick Link - For Chain or Cable. The diameter of the round stock is 10 mm (.393"). Overall dimensions of quick link is 1.671" wide x 3.583" long. You can use these for heavy duty interfacing between snap hooks, "S" hooks, cable thimble loops, or chain, on your free cable equipment.
These are also great for securing your expensive cable attachments to keep them from "disappearing" since most gym-goers will not come equipped with a wrench to remove it.