Watts Brothers Tool Works is a tool manufacturer located in Wilmerding, Pennsylvania. They are known for manufacturing

drill bits Drill bits are cutting tools used in a drill to remove material to create holes, almost always of circular cross-section. Drill bits come in many sizes and shapes and can create different kinds of holes in many different materials. In order ...

that can

drill A drill is a tool used for making round holes or driving fasteners. It is fitted with a bit, either a drill or driverchuck. Hand-operated types are dramatically decreasing in popularity and cordless battery-powered ones proliferating due to ...

square holes, including blind holes, which cannot be made with other methods such as

broaching The BROACH warhead is a Tandem-charge, multi-stage warhead developed by Team BROACH; BAE Systems Global Combat Systems Munitions, Thales Missile Electronics and QinetiQ. BROACH stands for ''Bomb Royal Ordnance Augmented CHarge''. Development of ...

. The Harry Watts square drill bit is based on a

Reuleaux triangle A Reuleaux triangle is a curved triangle with constant width, the simplest and best known curve of constant width other than the circle. It is formed from the intersection of three circular disks, each having its center on the boundary of the ...

shape. It is used together with a guide and a particular chuck to make a square hole.Scott Smit
"Drilling Square Holes"
in '' The Mathematics Teacher'', October 1993 (Volume 86 Number 7). Similarly, the company also manufactures drill bits for other angular holes such as pentagons and hexagons.

References

Tool manufacturing companies of the United States {{tool-stub