Competition Wheel Stud Set Press-In Style, 1/2-20 x 2-7/8 Inch Long, Stud Knurl Diameter .660 Inch (Hole Diameter .641 Inch). Grade-8 Steel with Black Oxide Finish. Set Of 10 Pieces Mr GasketNHRA Approved. Extra long wheel studs are used in competition applications where open end lug nuts are used to show full lug engagement. They are also used in applications where thicker wider wheels or the use of wheel spacers requires a longer than stock wheel stud. These Grade 8 Inchpress in wheel studs have a black oxide finish. 1 2 20 thread and 2 7 8 Inch long with an approximately . 660 inch knurl diameter. Length from bottom of the head to