Product function:fixed plate groove and hydrofoil base Hydrofoil Mounting T-Nuts, Hydrofoil Mounting T-Nuts for All Hydrofoil Tracks Product name:hydrofoil screw Colour:Gold Material:brass Package Contents: 4 * Hydrofoil screw Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.