Features:

• Insert your dive boot into your fin pocket, measure the distance from the center of one strap mount pin on the side of the fin, around your boot heel.
• To the center of the pin on the other side of the fin.Select the spring strap size that is shorter than your measurement by 0.5" to 1.5" (1.3 to 3.8 cm.
• Quick Release Buckles attached.Fin knob insert measurement (small hole): 14.6mm diameter. Fin knob insert measurement (big hole): 20.4mm. Fin knob hole middle measurement: 12.6mm.
• Spring length only: Small - 7." ; Medium - 8" ; Large - 9.5". Center of the buckle to buckle length: Small: 11", Medium: 12", Large: 13".
• Fits most fins, including Scubapro Twin Jet Max, Aqua Lung Rocket, Sherwood Triton, Tusa Imprex/Liberator/X-Pert Zoom/Solla and more.

Details: -Comes with a pair. -Available Sizes: Small, Medium, Large. -Quick Release Buckles attached. -Heavy duty material. -Comfortable design. -Rubber loop allows you to pull the strap easily.- Spring length only: Small - 7." ; Medium - 8" ; Large - 9.5". Center of the buckle to buckle length: Small: 11", Medium: 12", Large: 13". -Fin knob insert measurement (small hole): 14.6mm diameter. Fin knob insert measurement (bigl hole): 20.4mm. Fin knob hole middle measurement: 12.6mm

Color: Black