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Combined or Reamer Bit

The reamer bit increases the size of the hole after the smaller clay bit has made a first (pilot) hole.

Used Ideas

Rock Reamer

Double Reamer

Double Reamer

Triple Reamer

Triple Reamer

Chinese Auger

http://www.fao.org/docrep/X5567E/x5567e05.htm#4.5%20percussion%20%28also%20cable%20tool%20method%29

These drawings are taken from Koegel and are of the very old augering tools used in China

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Subpages (3): Double Reamer Rock Reamer Triple Reamer
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