Designed to fit buttons of various sizes and zipper pulls of all kinds, our button & zipper pull helper allows for independent, hassle-free dressing. Universal Zipper Pull & Snag-free Wire Loop: The Dr. Arthritis Dressing Aid features two main parts & functions--a slim, steel wire loop, designed to pull through narrow buttonholes and securely lock buttons in place; and a small, narrow hook at the other end of the device that slides easily into most zipper pulls for maximum functionality.