Santa Barbara Surfing SBS - No Tool Stainless Steel Fin Screw for Longboard and SUP - Choose 2 or 3 Pack NO TOOL REQUIRED: Hand Tighten Against Rubber O-Ring Means No Tools Ever RUST PROOF: 316 Stainless Steel Will Not Rust In Fresh or Salt water. COMPATIBLE WITH 99% OF BOARDS: Fits All Standard Surfboard Fin Boxes For Longboard, SUP, Single Fin, Paddleboard NOT COMPATIBLE WITH: Starboard & Naish Paddleboards owners report these are too short for those boards. SUPER VALUE: 3 Pack Means You'll Have An Excuse To Buy More Boards