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11 Chapter 5—Types of Axes and Related Tools Single-Bit Axes he European single-bit ax evolved into the Ameri- European cutting edge to the shorter, wider American Tcan single-bit ax with the addition of the poll. By cutting edge increased the accuracy and durability of adding weight to the back of the ax head, the poll pro- the tool. The poll and wider cutting edge of the Ameri- vided better balance and increased the striking force can single-bit ax (figure 5–1) increased its cutting effi- of the ax. The additional change from the long, narrow ciency and made it the new standard.