H&R Wheel Studs Thread Type 12X1.5 Length 40mm Knurl Dia 13mm Stud Seat TypeH&R offers a large selection of specialty wheel tightening bolts, studs, and lug nuts, available with a multitude of thread sizes and seat types. Lug nuts, bolts, and studs, may be used as replacement parts or with other H&R products. It's always a good idea to have a couple extras on hand! H&R Springs Wheel Bolts & Studs What's Included: H&R Wheel Studs Thread Type 12X1. 5 Length 40mm Knurl Dia 13mm Stud Seat Type