Woodys Grand Master Stud Package - 1.325in. Stud Length GMP-1325-84 The Grand Master snowmobile stud with a 60deg. carbide insertis designed specifically for single ply tracks. A 1.200in. head makes a larger anchor to distribute pressure over a wider area on the single ply track. This stud cannot be used in a traditional 2 ply track. The 2.52 pitch single ply track cannot accommodate the Round Grand Digger support plate. Use the Square and Double Grand Digger support plates.