This is a Mini Tuttle replacement set for the out-of-production Mini Tuttle fin boxes. For older NSP boards, these can be found on Surf Betty boards and a selection of longboards. Easily identifiable by the plugs on top of the board, you’ll know your board uses these in an instant.

Great to use as they’re single screw and don’t require hex-keys, but sadly no longer in production and hard to come by these days.