Scuba Choice Scuba Diving Universal Fin Spring Heel Strap with Quick Release Buckles (Pair), Medium

-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