One of the most important places in the complex of production processes of coal mining are occupied by roofing and roof management in longwall faces. The works on fixing and roof management are associated with high labor and timber costs. The main means of reducing the cost of fixing and roof management is the wide introduction of mechanized fasteners and metal organ walls. As industrial tests have shown, the best technical and economic indicators are obtained with organ walls OK and OKU-150. This kind of casing was the most widespread. As of July 1956, 182 faces in the Ukrainian Donbass and about 50 faces in the Rostovugol Combine were secured with the OK and OKU-150 organ walls. By the end of 1957 it is planned to introduce this fastener in 600 faces in a number of basins of the Soviet Union.