This Straightline Perfomance tool allows you to easily remove the "hard to get at" torx bolts that fasten the helix to the sheaves. We get this question all the time....What tools do I need to change the QRS helix on my XP,XR,XS Skidoo? Answer: SPI qrs helix removal tool and this extended Torx wrench. Get a spare torx bit also or you'll wish you did at some point. Job done.