#shank  cylinder forming the part of a bit by which it is held in the drill
  supertype:  cylinder.round_shape  a surface generated by rotating a parallel line around a fixed line
  part of:  bit.cutting_implement  the cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock or drill press; "he looked around for the right size bit"
     part of:  drill  a tool with a sharp point and cutting edges for making holes in hard materials (usually rotating rapidly or by repeated blows)
     part of:  byte  a sequence of 8 bits (enough to represent one character of alphanumeric data) processed as a single unit of information
        part of:  word.computer_memory_unit  a word is a string of bits stored in computer memory; "large computers use words up to 64 bits long"
           part of:  kilobyte__Kilobyte__k__K__kb__kB__kb__Kb__KB  a unit of information equal to 1024 bytes
              part of:  megabyte__Megabyte__Mb__MB  a unit of information equal to one million (1,048,576) bytes
                 part of:  gigabyte__Gigabyte__G__Gb__GB  a unit of information equal to one billion (1,000,000,000) bytes or one thousand megabytes
                    part of:  terabyte__Terabyte__T__Tb__TB  a unit of information equal to one trillion (1,000,000,000,000) bytes

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