3/4-16 threads with overall length of 1.750". Studs are sold individual with two 1/4-20 button head bolts that hold the stud in the motorplate from turning.
RBS also carries the 3/4-16 nut for this application if needed #450-0022.
Works with most all pro mod, alch. funny car or dragster, front engine fuel car, nostalgia funny car or late model touring top fuel cars.