Replace your damaged or missing MasterCraft Tower Breakaway knob. This breakaway knob fits 2007, 2008, 2009, 2010 and 2011 MasterCraft boats with a Zero Flex Flyer wakeboard tower including the X-1, X-2, X-7, X-14, X-14V, X-15, X-30, X-Star, X-35, X-55 and X-45. This tower knob is used to lock the enclosure that secures the front leg to the rear hoop. Includes pressed in nylon washer.