ClosetMaid knows that, sometimes, wire shelves pop out of position when clothing, towels and other material snag on the wire or when a heavy load is suddenly removed. That"s why they designed this notch-free bracket that not only locks down shelving but makes shelf-installation easy, too. The unit works with all ClosetMaid ventilated shelving--locking shelves into place for optimal stability. Brian D. Olson