Drill bit, how to distinguish that is drilling iron plate, that is drilling the wall, that is drilling, how to distinguish between wood?
The above two are glass drills, with two kinds of pointed and round heads. They can also be used to drill tiles. This is the impact drill, the drill is not sharp, and the teeth are not sharp.
Alloy steel head drilled into wall, not drilled iron plate!
This is an iron bit, and this drill can also be used to drill wood. It's universal, and its teeth are sharper.
