Description: 3 Pieces Future Tri Fins Box for Surfing SUP Screw Surfboard Surf Fins. Strong and durable plastic, to bear water pressure and UV. Comes with key and screws. These box are 3/4" deep box and 2 x 1/2" deep box. Side Boxes - 3/4" deep, 6.9 mm wide Center Boxes - 1/2" deep, 7.2 mm wide Size: 15x3x1.7cm / 5.9x1.2x0.7 inch Package Includes: 3 Pieces Future Tri Fins Box