Backup rolls that are intended to provide rigid support required by the working rolls to prevent bending under the rolling load. Rolling balance system to ensure that the upper work and back up rolls are maintain in proper position relative to lower rolls. Roll changing devices use of an overhead crane and a unit designed to attach to the neck of the roll to be removed from or inserted into the mill. Steel rolling Mill Plant protection devices to ensure that forces applied to the backup roll chocks are not of such a magnitude to fracture the roll necks or damage the mill housing. Other components include Roll cooling and lubrication systems, Pinions - gears to divide power between the two spindles, rotating them at the same speed but in different directions, Gearing - to establish desired rolling speed, Drive motors - rolling narrow foil product to thousands of horsepower, Electrical controls - constant and variable voltages applied to the motors, Coilers and un-coilers - to unroll and roll up coils of metal. If you need some steel rolling mill plants then log on to: http://www.machinesindia.com/manufacturer/STEEL-ROLLING-MILL-PLANTS.html from where you will find the names and contacts of leading steel rolling mill plants manufacturers in India and from around the globe.