The ARP 100-1110 3/8" x 1.000" Hex Head Header Bolts Set Of 16 is a high-performance fastener set designed for automotive racing applications. Manufactured by ARP in the United States, these black oxide bolts are specifically tailored for performance and custom fitment types. With a California Prop 65 Warning, these bolts are sure to meet the stringent standards set for auto performance parts. Ideal for engine components and racing setups, this set of 16 bolts is a must-have for any car enthusiast looking to enhance their vehicle's performance.