Drill the expansion screw with an electric drill. The diameter of the expansion screw is 10mm. How many millimeters does the drill bit of the electric drill need?
According to the regulations: expansion bolts have internal and external expansion of the points, the normal use of external expansion (drill bit larger than expansion bolts 2 mm); the expansion of the (drill bit and expansion bolts as large)
The diameter of the expansion screw is 10mm, and the drill of the electric drill needs 12 millimeters
