The Rear Shark Fin for the Husky 701 & KTM 690 is designed to protect your rear disc rotor from impact with a rocks or similar objects on the trail, the components are CNC machined from aluminium 6082 billet, The unit is held in place by means of the axle nut and an Allen Head Cap Screw. The block held in place by the axle nut serves as the chain tensioner block too.