Sunex's 1/2-inch drive head bolt socket set comes complete with 5 pieces. Their 4-inch length reaches past cam and rocker assemblies to service head bolts. Other features include head-bolt sockets for Nissan, Toyota, Honda, and Ford/GM trucks, a high-quality chrome-molybdenum composition, and flexible thin-profile sockets that can reach through access holes and past overhead camshafts. All Sunex impact sockets meet or exceed ASME specifications.