What are the drill bits for the cement board?
With the impact of the drill bit, but also to use the impact drill.
If you can only use a large diamond (diamond drilling machine) usually able to dry to a diameter of 200 if the professional ability to 400-500 mm
Now the big demolition company has a capacity to 1 meter in diameter
See how much you need to drill the general small hole hammer can drill the general hammer can be dry to 28 mm imported hammer can be dry to 40 mm
