"The 286 Phantom Series Snowmobile Studs and Support Plates by Woody’s have been chosen for their durability and reliability. Order the 5/16 -1.325"" (137 Track) from your Ski-Doo manufacturer. Pack of 96. A complete line of traction products developed specifically for Ski-Doo’s REV Gen4, XS, XP, XR tracks. Due to the unique track design, this is the only traction product available to maintain track warranty and track life. Kit complete with stud, nut and support plate. The only traction product approved by BRP."