A range of short cobalt drills (steel quality HSCo 8% Co) with cylindrical shank and flat face.
The shank diameter tolerance class is H6 and the cutting diameter is E8.
Helix geometry is 30° right-handed, the cut angle is 12° and the cut is centred.
C123 drills are available in ? 2 mm to 6 mm, and from ? 6.5 mm for C102.
Used to cut grooves to P9 tolerance.