OOK ReadyNail Small Sawtooth Hanger (1-Pack) 533197 - The Home Depot

Hands-free OOK ReadyNail Sawtooth Hangers have pre-inserted nails. All you have to do is place on the frame and hammer into the desired location. This hanger is great for use with wooden frames. Available
Sawtooth hangers are the most common type of frame hardware. They install easily into wood frames or canvas that may not have hardware already attached. They are self-leveling to help ensure your pictures hang straight.

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