Expert Quality, sockets adaptors forged from chrome molybdenum steel hardened, tempered with black phosphate finish. Packed in blow mould case.Contents: 3/8" (F) x 1/4" (M), 1/4" (F) x 3/8" (M), 3/8" (F) x 1/2" (M), 1/2" (F) x 3/8" (M), 1/2" (F) x 3/4" (M), 3/4" (F) x 1/2" (M), 3/4" (F) x 1" (M), 1" (F) x 3/4" (M)