Watts Brothers Tool Works

Watts Brothers Tool Works is a tool manufacturer located in Wilmerding, Pennsylvania, USA. They are known for manufacturing drill bits which can drill square holes,^[1][2] including blind holes which cannot be made with other methods such as broaching. The Harry Watt square drill bit is based on a Reuleaux triangle shape, and is used together with a guide and a special chuck to make a square hole. Similarly, the company also manufactures drill bits for other angular holes such as pentagons and hexagons.

References