Okay, wire, coated, screw lock.remember that time you needed to secure something through a grommet and .?These are those "seat locks" you see on bicycles now and then, often in store to keep the seat from being removed. The part that makes this awesome, is you get a pack of them, I have tossed two in all my edcs, they take up NO room but for a tarp shelter, to bind two things together temporarily, suuuper handy.See full review