The principal advantage of worm gears is their capability to offer large reduction ratios and correspondingly higher torque multipliers. They can also be employed as reducers for low to medium speed purposes. Also, since their reduction ratio is dependent on the quantity of teeth on the gear, they are much more compact than other kinds of gears. Like fine pitch leadscrews, worm gears are usually self-locking, generating them best for hoisting and hoisting purposes.