ARP 3008331 12-Point Nuts 8740 Chrome Moly with 5/16 - 24 Thread Size, Pack of 10 12-point style is more compact than traditional hex style Thread size is 5/16 - 24 8740 Chrome Moly Rated at 180,000 PSI, which is considerably stronger than Grade 8 hardware Package contains 10 nuts, each of which meets ARP's exacting quality control standards