High Speed Steel Two-Step Drill, 7.8 mm / 9.9 mm

A special drill bit used to make guitar tuning peg holes for installing Rotomatic type tuners.
It drills two different sizes at the same time. It creates an 9.9mm hole in the front of the guitar and a 7.8mm hole in the back. This gives vintage tuners a perfect, tight fit
Manufactured from HSS steel, it is well-suited for drilling into hardwoods.

Total drill bit length: 96mm
Tip diameter: 7.8mm
Second step diameter: 9.9mm
Tip working length: 9.0mm

High quality, made in Japan