An assembly is set of manufactured parts or components that work together in unison as one mechanism or device. A worm drive or worm assembly is a gear arrangement in which a worm which is a gear in the form of a screw meshes with a worm gear which is similar in appearance to a spur gear. The two elements are also called the worm screw and worm wheel. The terminology is often confused by imprecise use of the term worm gear to refer to the worm, the worm gear, or the worm drive as a unit. Like other gear arrangements, a worm drive can reduce rotational speed or transmit higher torque. A worm is an example of a screw, one of the six simple machines. One of the major advantages of worm gear drive units are that they can transfer motion in 90 degrees. This differs greatly from a warp drive. Features. 12 in. OEM Worm Assembly. Made with high quality materialSpecifications. Length 12 in.. Width 6 in.. Height 6 in.