The best transmission option is when large transmission reduction is essential. A worm equipment is related to a helical gear with a throat lower to improve the outer diameter of the wheel. The throat enables the worm equipment to wrap completely all around the threads of the worm. By slicing the threads on the worm rather than the enamel, and by changing the amount of threads, diverse ratios can be achieved without having modifying the mounting arrangement. A special function of worm gears and worm equipment assemblies is their potential to avoid reverse rotation.