The ARP 621-1500 Bolt is a high-performance fastener designed for automotive racing applications. With a 1/4-20 inch thread size, 1.5 inch length, and 5/16 inch hex head, this set of 5 bolts is perfect for securing engine components with precision and strength. Manufactured by ARP, a trusted brand in the industry, these bolts are sure to enhance the performance of your vehicle with their quality and reliability.