These A&M extended series heavy duty 1/4" steel concealed shelf brackets can be used for floating shelves, work stations or heavy duty shop shelving. Designed to be attached directly to the wall stud with the included 3/8" - 18 x 3" carriage bolts. The 90? straight bracket and easily be hidden with a lip around your shelf to give the look of a floating shelf. The extended concealed bracket is designed with mounting holes above and below the shelf surface for superior strength.