Diler Holding, consolidating with her subsidaries and affliates active in steel (carbon & alloyed) production, foreign trade, energy, shipping, port operation, mining, banking and tourism is one of the business conglomerates of Turkey, was established in 1949 with the inauguration of a rolling mill in Karabuk, in the Black Sea region of Turkey, where first blast furnace plant of the State owned iron & steel works went into operation in 1939.