Usage Tips:Welcome to Litzee Store! Always keep extra screw and fin plate in your paddle bag for replacement. This set of Screw & Fin Plate is a universal fit for most fin box on the market and need no screwdriver to install it. Say goodbye to your screwdriverIt is designed to move a fin back or forward, install fins in a perfect position. Features: 304 stainless steel construction, rust and corrosion resistant. Eliminates the hassle of using a screwdriver in surfing. Measure 14 * 14 * 3mm (0.55 * 0.55 * 0.12) for plates. Fits industry-standard fin boxes. A rubber O-ring to eliminate loosening while surfing.A perfect and must-have replacement fit for long board surfers.Specifications:Material: 304 stainless steelModel: M4Screw size: 4 * 30.85mm / 0.16 * 1.21inThread length: 17mm / 0.67inPlate size: 14 * 14 * 3mm / 0.55 * 0.55 * 0.12inItem weight: 9g / 0.3oz (One Pack)Package size: 12.5 * 8 * 1cm / 4.9 * 3.1 * 0.4inPackage weight: 28g / 1.0ozPackage List:3 * Screw3 *Plate In the title and we have provided details of the product including its features and specifications, please note the size and dimensions of the product to ensure it meets your needs. Warm reminder: Due to lighting effects, monitor brightness, manual measurement, etc., there may be some slight differences in color and size between photos and actual items. Sincerely hope you can understand. During the shopping process, if you have any questions, please feel free to consult us, we will reply to you within 24 hours, I wish you a happy shopping!