Twist Drill for rotary drills – Granite
This is a Granite twist drill bit to use with a rotating drill.
This type of drill bit is called “Blue” because the colour of the new bits.
The diameter goes from 2,5 mm up to 30 mm.
These drill bits work at a low speed: 400/500 rpm.
Have a look at the video below about the smallest bit in the range. It’s a drill bit for granite with a diameter of 2,5 mm: