Timing belts highly versatile in application and speed range. Timing belt drives are positive and offer accurate synchronisation of speed, and often make possible worthwhile economies in the design of a machine, because they require less space, reduce bearing specification, eliminate tension devices, yet assure an unusually high degree of efficiency. Virtually every industry has tested and approved timing belt drives. They have been adopted as standard equipment by a wide variety of machine builders and equipment manufacturers. Millions of successful drives in operation without belt replacement for more than five years bear testimony to these drives.