Grand Master has 60 degree carbide insert with a 5/16" steel shank. A 1.200" head makes a larger anchor to distribute pressure over a wider area on the single ply track. Big Nut ALN2-4500 is included in the 1.325", 1.450". 1.575" length studs are packaged with ALN2-7000 Big Nut. 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.