Woody's 60 Carbide Gold Digger Traction Master Studs. Ourmost popular! From the leader in traction and control productsA stud that can be used by trail riders or lake racers alike.Allows advanced traction on hard packed and icy trails withexcellent durability. Woody's latest improvement to its bestselling line of studs is this new 60 Traction Master Studwhich is sharper and larger in diameter. Offered in 4 sizeswith 7mm shank-6 sizes with 5/16" shank. 24 studs w/lock nuts:.920 - 5/16.