Capri Tools 30081 Impact Reducer and Adapter Set, 6-Piece Drop forged, heat treated Chrome Vanadium steel socket to ensure strength and durability Finished with black oxide coating to resist corrosion 3-piece Impact Reducer: 3/4"(F) x 1/2"(M), 1/2"(F) x 3/8"(M), 3/8"(F) x 1/4"(M). 3-PIece Impact Adapter: 1/2"(F) x 3/4"(M), 3/8"(F) x 1/2"(M), 1/4"(F) x 3.8"(M). The socket bit comes with a lifetime replacement guarantee from Capri Tools