Starrett DCH0214 Deep Cut Bi Metal Holesaw has the following specification:

Diameter: 57mm (2.1/4in).

The Starrett Deep Cut Bi-Metal Holesaws offer aggressive material penetration and kerf clearance. Improved tooth material for enhanced heat and wear resistance and greater product life.

Ideal for solid materials or tubes with a wall thickness greater than 3mm. The large cutting depth improves cutting performance on tubes, particularly where there is a need to cut through both sides of the tube.

Cutting Depth: 51mm.