Spring Hook 16mm x 160mm
It uses a unique centre spring arm in the shape of a loop - so again no sharp points while you have wet hands hanging upside down under a boat trying to clip on the dinghy.
Big enough to go around a 1" (25mm) pipe or into saddle or u bolt and a full hand fits in it to hold it. (see photo)
We often used to have to use the french equivalent at $77.00 these are just $38.50.
Yes, they are grade #316 stainless steel so a simple reliable, a huge (160mm long) (15mm) 5/8" bar and grab hook that will perform.