SBS - Stainless Steel Longboard Fin Screw & Plate - Pack of 3 TIME TESTED DESIGN: 3 Pack of Stainless Steel Longboard and SUP fin screws. Usage: Slide in fin box, insert fin, put screw in, tighten with slotted screw driver. UNIVERSAL FIT: Fits All Standard Fin Boxes. Plate is .55"x.55"x .15" (14mm x 14mm x 4mm). Screw is 10-32 X 3/4"(5mm x 19mm) Long. HIGH QUALITY MATERIALS: 316 Stainless Steel Plate and 18-8 Stainless Steel Screw. WILL NOT RUST 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.