The Dolle Jam Adjustable Opening Shelf Support is crafted with die-cast zinc alloy with powder-coated chrome, clear-coated for a durable and attractive finish. Once mounted, all screws and hardware are hidden for a clean, polished look. The supports hold up to 33 lbs. when used with a shelf 8 in. or less in depth, with all mounting hardware and instructions included for quick and easy installation.