Sutton Tools Impact Bi-Metal Holesaw are designed for use in impact drivers. These holesaws are suited to cut sheet metal up to 3mm (maximum thickness). They are ideal for electrical installation, junction boxes, ducting and general sheet fabrication.
Features

1/4"-Hex Shank - Suitable for impact drivers
Ejector Spring - Quickly ejects waste material
Thin Wall & 8 TPI (Teeth per Inch) - For fast and burr free cutting
Stop shoulder - To prevent over drilling
Bi-Metal HSS - Premium quality for toughness and longer life

Specifications

Diameter: 54mm (2.1/8")
Shank: 1/4"-Hex