Belt conveyors include flat belt, magnetic belt and trough belt conveyors. Belt conveyors are the most commonly used type of bulk handling conveyor because of their reliability, versatility, and range of capacities. Belt conveyors use an endless fabric-covered belt that traverses between two or more pulleys. The belt is supported by idler rolls at intermediate points. Belt conveyors can handle materials ranging from fine powders to large, lumpy stones.