The ideal transmission option is when high transmission reduction is essential. A worm equipment is related to a helical gear with a throat minimize to boost the outer diameter of the wheel. The throat permits the worm equipment to wrap entirely all around the threads of the worm. By reducing the threads on the worm relatively than the enamel, and by changing the amount of threads, various ratios can be achieved with out shifting the mounting arrangement. A unique attribute of worm gears and worm gear assemblies is their potential to prevent reverse rotation.