Bob from SWISCO responded:
March 22, 2021
The first number is the size of the base, the second number is the height of the pile. The pictures on each wool pile's shop page show this; for an example, I've reproduced the picture of the 58-045 dimensions below. We don't have any wool pile with a 3/20" base, so please double-check that base dimension. Let me know if you have further questions. Profile view of 58-045
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