■ Items are inspected before shipping ■ ■ We have a proven track record, so you can buy with confidence ■ This is a screw bolt for securing center fins for longboards, SUP boards, etc. Box fin. Easy one-touch operation. Simply push and turn while attached to the fin. I also use it, and it has dramatically sped up the installation process. One piece. Bolt diameter: Approximately 5mm Material: Stainless steel Available for purchase without comments. No price negotiations, please. We will ship on the same day or the next day after purchase. We also sell other surfing screws and goods. Fin keys are sold separately. Surfing Surfboard Longboard Single fin Center fin FCS fin Fin key Grub screw future FCS Screw Screw Hexagon Driver Leash cord Deck pad Fin FCS2 Box fin Compatible Infill tab kit Fin plug Adapter Tab system Fin screw fin Fixing bolt One-touch