Brand: Automotive Racing Products (ARP)
These high-strength (180,000 psi) chrome moly nuts match the ARP 3/8-24 Black Oxide Bolt 5-Packs (sold separately).
The 3/8-24 UNF (fine thread) nuts take the same 7/16" 12-point socket as the matching bolts, but with a standard 0.625" bearing surface (the matching ARP 744 series bolts have an oversized 0.70" OD bearing surface). Each measures 0.39" high overall. The black oxide finish looks great and is easy to paint if desired. Pack of 10 nuts.