Hobie ST Turbo V2 Fin Kit MD 180 Bk G casual fishing rod Crafted to be compact and Crafted to be compact and efficient This bottle cap accessory is also 100% leakproof The Hobie Mirage Turbo Fin Kit will make you the envy of your paddling community Kit includes two fins and two masts Threaded kits are for all Mirage Drives that the masts screw into the sprocket (post July 2008) The fin tension screw allows adjustment to achieve lower end torque or top end speed to meet individual preferences Only fits Hobie Mirage Drive 180 The Hobie Mirage ST Turbo Fin Kit upgrades the Mirage Drive with new fins and masts to increase the surface area by over 10 percent