Because races can be won or lost in the pits, the engineers at ARP set about to create the ultimate oval track competition wheel stud that facilitates accurate wheel positioning and quicker release / tightening of lug nuts. ARP's new Speed Studs (and companion Speed Nuts) are so good that a large number of NASCAR teams in Cup, Busch and NASCAR Truck series use them exclusively. They're made from heat-treated 190, 000 psi chrome moly steel and feature precision J-form threads (formed after heat-treat for improved fatigue strength), exclusive nut-starter and bullet shape radius that all but eliminates cross-threading, shot-peening, special baked-on dry film lubricant (reduces possibility of galling and assures consistent clamp loads), and double magnaflux inspection. a new head design is employed that fits the registers of all popular hubs without grinding, and studs are available in 27 underhead lengths to provide you with the optimum thread engagement for your particular setup. The finest studs available!Pit Stop USA offers ARP NASCAR Speed Studs Wheel Stud Kit - 5/8"-18 Thread - 3.150" Under Head Length - 0.660" Knurl Diameter - 1.200" Knurl Length - (5 Pack) 300-7716 at low everyday prices. Be sure to check out all of our products from ARP including ARP 5/8"-18 Wheel Studs and ARP Hubs.