Drill bits are cutting tools used to create cylindrical holes. Bits are held in a tool called a drill, which rotates them and provides axial force to create the hole. The twist drill bit is the type produced in largest quantity today. The twist drill bit was invented by Steven A. Morse of East Bridgewater, Massachusetts in 1861. A core drill bit is used to enlarge an existing hole.

         

         

         

         

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