4-12mm Number of Steps: 9 Included:4, 5, 6, 7, 8, 9, 10, 11 & 12mm Shank: 6.0mm Drills: Sheet metal, steel & plastic Cut depth: Up to 4mm Suits: Non-hammer action portable power drills Fully ground premium HSS M2 to increase durability TiN coating reduces heat and wear for product longevity Non-skid tip eliminates the need for pre-drilling 2 flute design for smoother cutting Laser etched hole Non-slip shank