For Glass Shelves or Wood Shelves from 3/16" to 3/4" Thick. For Shelves Up to 12" Deep (Protrusion from Wall) Heavy Duty Shelf Brackets are made of durable die-cast metal and powder-coated finished for a beautiful look. These shelf brackets are designed so no mounting screws or hardware are visible once installed. Hanging the shelf supports is simple and quick. Screws, anchors and assembly instructions included. Maximum recommended weight per pair of shelf brackets correctly installed is 60 pounds. Finish: Polished Chrome Size: 3" D x 3" H x 1-1/2" W Additional Product Information: An adjustment screw is also included to accommodate various glass thicknesses.