Always keep an extra screw and fin plate in your paddle bag for replacement. This Screw & Fin Plate set offers a universal fit for most fin boxes on the market and requires no screwdriver for installation. Designed to adjust the fin position forward or backward, it allows for precise fin placement. Made from 304 stainless steel, it is rust and corrosion resistant. The included rubber O-ring helps prevent loosening during use. Plate dimensions: 14 x 14 x 3mm (0.55 x 0.55 x 0.12in). Compatible with industry-standard fin boxes. Ideal replacement for longboard surfers. Specifications: Material: 304 stainless steel Model: M4 Screw size: 4 x 30.85mm (0.16 x 1.21in) Thread length: 17mm (0.67in) Plate size: 14 x 14 x 3mm (0.55 x 0.55 x 0.12in) Item weight: 9g (0.3oz) per pack Package size: 12.5 x 8 x 1cm (4.9 x 3.1 x 0.4in) Package weight: 28g (1.0oz) Package List: 3 x Screw 3 x Plate Note the size and dimensions to ensure compatibility. Due to lighting, monitor settings, and manual measurement, slight variations in color and size may occur. For any questions, please and we will respond within 24 hours.