Press-In Wheel Stud Bulk Pack, 5/8 - 18 x 3,.672 knurl for circle track applications. Standard hole size.663 to.670Press-In Wheel Stud Bulk Pack, 5/8 - 18 x 3,.672 knurl for circle track applications. Standard hole size.663 to.670 Exceeds sanctioning bodies requirements on the use of extra long wheel studs with thick-hub racing wheels Manufactured from high grade SAE 8740 steel to withstand sheer loads of 190,000 psi (which exceeds Grade 8 specifications) Feature a quick start dog end for easier starting of lug nut installation Made in the U.S.A.