JAM metal shelf bracket is made of die-cast zinc alloy, powder coated and then clear coated for a durable and attractive finish. JAM is adjustable to accommodate shelves from 1/4" to 3/4" thick. When used with a standard shelf 8" or less in depth, the JAM can support up to 33 lbs. The small rounded profile of JAM works everywhere. Once mounted, all of the screws and hardware are hidden for a clean and finished look. JAM is sold in pairs and each pair comes with all of the necessary mounting hardware for quick and easy shelf installation.