If you can’t do it by hand, then you need a power tool. And you probably already have one. Simply apply this 5″ and 7″ backing plates along with the a 5/8″ threaded adapter (included) to your polisher, drill, or cordless drill and you’re ready to polish away hard water, stains, dirt and other debris from glass, metal, fiberglass, and more. Designed for professionals. Applicable for the do-it-yourselfer.