Currently there are 4 different types of miragedrive fin masts. These are version 1 standard and turbo as well as version 2 standard and turbo. Standard masts fit standard and ST fins. Turbo length masts fit turbo fins. Version 1 styles secure to sprockets using grub screws. Version 2 masts screw into a threaded insert in the sprocket (pictured above).
Masts sold individually