ITEM NAME:Surf Fins Clip Buckle Accessories for Surf Longboard in Description: Made of qualified nylon, solid, reinforced, durable and strong. Used to lock the fin after we insert it into the base to stop it from falling off. Come with a short thread. Suitable for most of the Fins. Specification: Material: Nylon Color: Black Size(LxW): 4.1x1.4cm / 1.6x0.6inch Package Includes: 4 Piece Surfboard Fin Clip Note: Please allow slightly difference due to manual measurement. Color may be slightly different since different monitor. Thanks! SKU: DMO0021078419511010.4 Piece Surfboard Fin Clip. Suitable for most of the Fins. Used to lock the fin after we insert it into the base to stop it from falling off. SKU: DMO0021078419511010. Color may be slightly different since different monitor.