The drill bits are cutting tools which you use in a drill and that is used to make the cylindrical holes in surfaces such as the concrete or the glass or wood or even the ceramic tiles.
These drill bit or shanks are made up of the hardened steel and these have the tip which may or may not be made of a different material and is attached on to the tip of the drill so that the piercing action is strong enough especially when you are drilling the tougher holes like the one in concrete.
The glass or ceramics need special care while drilling to avoid breakage
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