This product will be shipped via standard mail. For those who wish to use Yu-packet Post Mini with tracking, shipping will be 1550 yen. Easy fin attachment and removal! Quick Fin Lock Screw, no screwdriver needed (for surfboard, SUP center fins/box fins) By attaching this to the center fin of longboards, mid-length boards, SUPs, etc., you can insert the plate into the fin box to adjust the position, freeing you from the hassle of tightening screws. It makes attaching and removing fins smooth before and after surfing. Please refer to the product image for installation instructions. (The spring may be stiff when you start using it, so please be careful not to get injured during the process.) Features a stainless steel tab designed with water resistance in mind. Easy attachment and removal without tools. Rust-resistant stainless steel fin lock system for box fins. Insert the fin with the lock attached into the BOX, and the spring lock mechanism will secure the fin inside the BOX. You can easily remove or adjust the position of the center fin underwater. Included: Pin, spring, base metal fitting, set screw, hex wrench Material: Corrosion-resistant stainless steel 316 Specifications: Pin length 36mm, pin diameter 4.2mm (Fin with holes of 4.2mm or less will require modification.) No price reduction is possible. Since standard mail delivery on Saturdays, Sundays, and holidays was discontinued from October 2021, shipments on Thursdays and Fridays will be delayed in arrival. Please note that returns and exchanges are not accepted. Surfing Surfboard Longboard Single fin Center fin FCS fin future FCS Screw Hex Driver Leash cord Deck pad Fin FCS2 Box fin Compatible Infill tab kit Fin plug