This TEQ Correct product has been carefully engineered and manufactured to provide dependable operation. Made from tempered chrome-vanadium steel for strength and durability. Product Contents: (18) 3/8 Drive Sockets-. SAE: 1/4, 5/16, 3/8, 7/16, 1/2, Product Features:Chrome-plated finish resists corrosionSpring-loaded ball bearing securely holds sockets in placeDurable reusable storage box