Chelyabinsk is one of the major industrial centers of Russia. Heavy industries, especially metallurgy and military production, are predominant in the area, notably the Chelyabinsk Metallurgical Combinate (CMK, ChMK), owned by the mining corporation Mechel. Other important industries include Chelyabinsk Tractor Plant (CTZ, ChTZ), Chelyabinsk Electrode Plant (ChEZ), the machine part-producing Chelyabinsk Forge-and-Press Plant (ChKPZ), the crane-producing Chelyabinsk Mechanical Plant (ChMZ), and Chelyabinsk Tube Rolling Plant (ChTPZ), which is included in the "Big Eight" of pipe producers in Russia, and produces large-diameter pipes for use in pipelines. Chelyabinsk Zinc Plant, owned by the Ural Mining and Metallurgical Company, produces about 2% of the world's zinc supply and over 60% of the Russian supply. Kolyuschenko Road Machinery Plant produces construction machinery and dump trucks for the American manufacturer Terex.