The 1-Hole D-Ring Hanger is the only one specially designed for canvas and open back frames. The D-rings are hidden, so the picture never leans off the wall and the hardware isn't exposed. These super strong hangers are also perfect for wall décor accessories such as mirrors.Details:2 hangersZinc alloyEach D-ring hanger comes with 1 screwHolds objects weighing up to 25 lb.No studs or anchors needed