The engineers at ARP spent quite a bit of time developing these highly effective , unique oil pan studs. They're designed to make it as easy as possible to install a pan and make it seal properly. You'll note that the studs have a radiused bullet nose that serves to locate the pan rails, then allows the nuts to be easily installed without the worry of cross threading. For those who prefer bolts, ARP's got you covered too. Both are available in black oxide finished chrome-moly steel or rust proof stainless steel. Also, you may choose between conventional hex style or space saving 12 point nuts. The stud kits come complete with a special locking flanged nut, while the bolt kits come with washers.