Venom Products Twin Trax Helix for TSS-04 Clutch - 54-40 x 54-42 LW420406Developed to produce a quick upshift and improved backshift for excellent throttle response Dual angle option helix offers fine tunin for changing conditions Available in a variety of multi angles for almost any application ER helixes are for Ski Doo and Polaris machines with engine reverse Helixes for TIED8 and TSS 04 clutches are NOT interchangeable Type Example: Type F = full progressive; type . 46 = . 46 progressive Sold each