HangZ™ 40030B 20lb (50-Pack) Flat Mount Sawtooth Hooks. There is NO other hanger on the market specifically designed to be used with any type of Sawtooth hanger. The HangZ™ patented design eliminates the unsightly view of the traditional hook when hanging works of Art with Sawtooth hangers. Never see the hook again. Ideal for Picture Frames, Mirrors & Canvas.