Square and screw for double hydrofoil US Box (x4)

This set consists of four squares and four screws suitable for screwing on a double US Box to install a hydrofoil one board. These compoments are made with inox to ensure a better resistance to water, sand and salt. The tightening system requires a 4mm key but no screwdriver to make an easier use. These squares and screws correspond to the norm so they can fit any double US Box and any hydrofoil with a classical top plate mount.