These hangers are designed for canvas and open back frames. The sawtooth hook and hangers are hidden so the pictures never lean off the wall with no exposed hardware. They are also self leveling so you can be sure your wall decor will hang straight. Details:Antique brass finishHolds up to 15 lb.4 piecesSelf-levelingMetalCompletely hidden; no more exposed hooks or hardwareDesigned for use with canvas and open back frames