The document discusses the SCBC-R large conveyor backstop units manufactured by Rotech Systems in South Africa. The backstop units are designed to prevent reversal of inclined conveyors and vertical bucket elevators. They are directly mounted on drive shafts without slip fitting and contain rollers to provide high overload capacity. The backstop units range in size from the SCBC-006R to the SCBC-180R and can be specially manufactured.