SBS - Breakaway Longboard Fin Screw & Plate - Pack of 3 PROTECTIVE BREAK-AWAY DESIGN: 3 Pack of Breakaway Longboard, SUP and Single Fin Screws. Plastic plate is designed to break upon impact, preventing fin box damage. Brass screw is corrosion resistant. UNIVERSAL FIT: Fits All Standard Fin Boxes. Nylon Plate is .55"x.55"x .15" (14mm x 14mm x 4mm). Brass Screw is 8-32 X 3/4"(4mm x 19mm) Long. EASY TO USE: Slide in fin box, insert fin, put screw in, tighten with flat head screw driver. FREE STICKER: We include our Santa Barbara Surfing sticker in the package so you can represent. 1% TO CHARITY: Every month we send 1% of our sales to a charity. This month it is SurfAid which is improving the health, wellbeing and self-reliance of people living in isolated regions connected to us through surfing.