Thank you for looking! ⑅◡̈* ◆ Brand new, unused item! ✨ ◆ Ships same day! ✨ ◆ Immediate purchase is welcome! ✨ ◆ Please read my profile before purchasing. Also available on my shop ❤️ #ayatan♡Shop Items I've gathered many great deals! Please take a look! ⑅◡̈* [Product Name] AQUA MARINA US Fin Box Adaptor Model Number: B0302763 [Product Condition] New, Unused *The outer box may have been opened once for content verification. [Product Details] This is an adapter to attach US fin box compatible fins to slide-in type fin boxes. Even if your SUP board has a slide-in type fin box, you can attach a wider variety of US fin box compatible fins by using this adapter. Brand: AQUA MARINA Size: 8.3 inches (21.2cm) Main Use: SUP (Stand Up Paddleboard) fin standard conversion