These ARP stainless steel fasteners are listed as 5/16-18 x 4.750 with a 12-point head, supplied for use in assembly and fabrication where that thread, length, and head form are required. The product description provides the precise size and 12-point configuration along with stainless steel construction without extending claims beyond the stated hardware specifications.
ARP 5/16-18 X 4.750 12pt SS Bolts