It is a 3" stainless steel headless nail with a yellow plastic sleeve/condom about 1mm thick covering most of it.

A friend asked me to clear out her deceased husbands workshop after her sons had taken what they wanted and could reasonably transport back to Britain.
Shed loads of bits, the usual car nut sailing DIY stuff which was cool but I found this and it is driving me nuts trying to figure out what it is used for.








you beat me to it Jammy 








