For years, we have used donuts with one hole to keep our shackles from going into the spin pole jaw. These had to be tapered or whipped in place.
With this shackle stop, you simply put it in the eye splice when you are splicing on the shackle. No messy tape or whip that keeps coming undone.
Use with - spin pole after guys, spin tack lines, in place of a halyard ball.
Our small size is used on J-30, Farr 40.
Our large size is used on TP52's.