A metal cylinder threaded on the outside for tightening into and threads on the inside for attaching a screw. To repair either a stripped insert or a drilled hole in a board which was used to attach a binding.
an insert made out of strong steel that use to repair threads
a spiral of hardened metal sort of like a set of threads with neither hole nor bolt
a tightly wound coil of steel, that is turned into a whole, generally a bit bigger than the original
a trade name for a coil-type thread insert, commonly used to replace a stripped spark plug thread