Cobalt drill bits: Classic M2 High Speed Steel construction with Black and Gold finish for proven capability and durability. Hardness: M2 Twist drill bits’ Rock wall Hardness Level HRC 62-63. Package & Size: 12 Pieces drill bits in a plastic bag, Diameter 7/32 inch, Total length 3-3/4 inch, Working length 2-1/2 inch. Professional & DIY Use: For use on metal, wood & plastics. Not For Use On Concrete / Masonry. Perfect match for workshop or service vehicles. 135 Tip & Twist Design: Increases cutting speed with self-centering and prevents walking, clears chips and particles faster. Material: M2 High Speed Steel.
* Angle Point: 135 Degree.
* Shank Type: 3-Flat Shank.
* Specification Met: ANSI.
* Hardness: 62-63 Rockwell.

High Speed Steel:
* High speed steel construction provides ultimate durability, the cutting edge is hardened and honed for sharpness, chatter-free design with staggered cutting teeth ensure the precise countersinking and hole smooth clean.

Twist Design:
* The split point tip and twist design increases cutting speed while easy self centering prevents walking. Say bye to all those chips and particles, with the twist design the drill bit can quickly clears them out, and leaves a clean, smooth hole.

Notice:
* Please keep cool and gentle using, the working life of the twist drill bits can be largely prolonged by proper usage.
* Not For Use On Concrete, Masonry.