Watts Brothers Tool Works

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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.


  1. ^ Drilling Square Holes[dead link]
  2. ^ Watts Brothers Tool Works (1950–1951). How to drill square hexagon octagon pentagon holes. New York: Wilmerding, Pa. : The Company,.