Albert R. Mann Library
Gut and gut template

A rating system used to describe the diameter of leader or tippet material. The X-designation is derived from a centuries-old system used by watchmakers to standardize thicknesses of wire.

In the 19th century, in response to market pressure for smaller-diameter leaders, silkworm gut manufacturers developed processes in which gut was “drawn,” or pulled through progressively finer diamond-edged holes in metal plates. The technique was similar to the watchmakers’ technique for sizing wire, and the gut manufacturers adopted their classification system as well.

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