ARP 3008331 Stainless Steel 12-Point Nuts, Package Of 10, With 5/16 - 24 Thread Size And 3/8 Socket Size

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12-point style is more compact than traditional hex style
Thread size is 5/16 - 24, and socket size is 3/8
Constructed from the finest aerospace-quality polished stainless steel
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