My boat has a pair of these at the bow, Skene(?) bow chocks.
I've never had a boat with them before and don't have a clue how to use them. I'm assuming they are there to tie off the anchor line, but not sure the correct usage.
Are they just a guide to keep the line on a specific side, and then fasten it with a cleat?
Note date, May 18th, this probably qualifies for dumbest question of the day.