The ST (Square Top) Turbo Fin Kit is a complete kit designed to upgrade Hobie Miragedrive standard or ST fins to longer 'turbo' variant. Kit includes 2 x fins, 2 x fin masts and fitting hardware.
There are 2 versions of the turbo fin kit available. V1 (pictured above) utilizes a set screw to secure masts into sprockets. V2 (pictured below) threads into brass socket
72066001 - ST Turbo Fin Kit V2 / GT - Grey / Black
72066031 - ST Turbo Fin Kit V2 / GT - Blue / Black
72065 - ST Turbo Fin Kit V1 - Grey Black