Team Industries Helix Bolt For Rapid Reaction Clutches 105229 Developed 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 revers Type F equals full progressive; type .46 equals .46 progressive