The very best transmission selection is when high transmission reduction is needed. A worm equipment is equivalent to a helical gear with a throat minimize to improve the outer diameter of the wheel. The throat enables the worm gear to wrap totally all around the threads of the worm. By cutting the threads on the worm fairly than the teeth, and by adjusting the amount of threads, different ratios can be accomplished without having changing the mounting arrangement. A special attribute of worm gears and worm gear assemblies is their potential to stop reverse rotation.