Most spring strap systems are designed for a fin or style of fin strap attachment. XS Scuba takes the guess work out of knowing it fits. Universal Spring Fin Straps Kit contains 3-styles of 316 stainless-steel buckles bound to fit whatever fin you have. old school buckles for Turtle, Power, Frog, Twin Jet and others (see SKU's: XSSFTE, XSSFP, CSBFFP SCPFTM) large post buckles fit most modern fins and even a Small Post for Atomics (see SKU's: ATMFX1, ATMFS, ATMFB). Springs are built-to-last manufactured from .025" (6.35mm) diameter stainless-steel with an internal cave line to limit overstretching of the spring. Fin strap is covered in heavy-duty nylon tube webbing, with a large sure-grip pull tab for ease of putting on and taking off. Straps are easy to install and come in 3-spring lengths of 8", 10" or 12" (20.3cm, 25.4cm or 30.5cm) with overall strap and buckle lengths of 10.5", 12.5" or 14.5" (26.7cm, 31.8cm or 36.8cm). So, if you want the benefits of a spring fin strap these are the ones you want.