The ideal transmission option is when substantial transmission reduction is needed. A worm gear is similar to a helical gear with a throat cut to enhance the outer diameter of the wheel. The throat permits the worm equipment to wrap completely about the threads of the worm. By reducing the threads on the worm instead than the tooth, and by adjusting the amount of threads, various ratios can be reached with out shifting the mounting arrangement. A distinctive function of worm gears and worm gear assemblies is their capacity to stop reverse rotation.