IR Socket Set includes 1, 1-1/16, 1-1/8, 1-1/4, 1-5/16, 1-3/8, 1-7/16, 1-1/2, and metal tray for storage. Each socket is heat treated to withstand the pounding of Ingersoll-Rand's powerful impact tools. All are manufactured of high grade steel and are through hardened for top quality and long life.