Made of hi-strength Acetal resin, the Finjak replaces the stock screw and sliding plate and eliminates the need for tools to install, remove, and adjust the position of the classic Bahne-style fin.
The Finjak works on front-tab fins, but I designed it for rear tab fins. If you’re using it on a front tab fin and you hit something in the water, it could release, especially on longer fins. This can be a good thing, saving a broken fin or box, (or person). It's a good practice to check your board whenever you hit something, but especially important when using a front-tab fin.