The IST FB7 Replacement Quick Release Buckle Set for FS7 Fin Strap is a replacement part for the buckle used on IST FS7 fin straps. Constructed of sturdy, impact resistant plastic. Quick release mechanism opens with a simple squeeze, yet holds securely when closed. Keep some spares in your save a dive kit to be ready for fin buckle emergencies. Single buckle set, for use on one side of a single fin strap. Buy two to replace both buckles on one fin, buy four to replace both buckles on two fins.