Heavy Duty hidden floating shelf brackets Heavy duty solid steel design for holding heavy shelves when securely and properly mounted to a stud. Made to be secretly mounted into the back of a wood shelf and not be seen Size- Hidden shelf brackets are 6 inches long and made form 1/2 diameter steel bar. The backing plate has 2 mounting screw holes and is 1.5 inches x 2 inches Includes: 8 brackets hidden floating brackets Installation screws and wall anchors