Faithfull Step drills are used for cutting varying hole sizes in material up to 4 mm thick without changing the drill bit. Each drill cuts parallel holes within a specific size range, rising in 2 mm increments.
The set of three is supplied in a metal storage case.

Sizes 4 to 14 mm. Increments of 2.0 mm.

Max thickness 4 mm.

Made from HSS ( High Speed Steel ).

Shank: 6 mm diameter.