The ideal transmission option is when high transmission reduction is required. A worm equipment is comparable to a helical gear with a throat minimize to improve the outer diameter of the wheel. The throat allows the worm gear to wrap totally around the threads of the worm. By slicing the threads on the worm fairly than the enamel, and by adjusting the number of threads, different ratios can be attained without having changing the mounting arrangement. A special feature of worm gears and worm gear assemblies is their capability to avert reverse rotation.