Watts Brothers Tool Works

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Watts Brothers Tool Works is a tool manufacturer headquartered in Wilmerding, Pennsylvania. They specialize in drill bits that can cut square holes, including blind holes that other methods can’t make. Their Harry Watts square drill bit is based on a Reuleaux triangle shape and works with a guide and a special chuck to drill square holes. The company also makes drill bits for other angled shapes, such as pentagons and hexagons.