D14-D16 dozens of holes in 2mm thick metal. Machine to be spun.
SSS crowns cheaper than the drill, specialized 2-3x more expensive. What kind of work performance crown? Or after a few holes will not throw?

snd just drill a 3mm D14 metal 10-hole which took maybe 15 minutes,
a good drill, I bought a long time do not remember for how much. And if you've worn the same
drill tip, and Grez with the smaller, then the greater. Not forgetting the
increasing chilled water and pokers drilled for small roundabout.

stepped-cone drill, without having to rotate a drill

No one among you neliepia pirkt
An old man stepped drill about 45 €.
with the door frames of about 200 holes monteriukai drive

The time when the crown Grez with the mind.
as conical drills