Lock nuts are 6061 T-6 aluminum for strength with a nylon insert
Extra support helps eliminate bending and breaking without adding any additional weight
.500in. tall lock nuts are for 1.187in., 1.375in. and 1.500in. studs using Super Lite backers
.750in. tall lock nuts are for 1.625in. and longer studs using Super Lite backers
5/16in. -24 threads