Replacement sharpening stones for the TrueSharp power rotary blade sharpener. These diamond-grit stones are long-lasting and put a sharper cutting edge back on your rotary blade. Both the coarse-grit and the standard fine-grit stones are available.
Use the coarse grit stones on blades that are really dull and can't even cut a single layer of fabric, blades with minor nicks, or blades that are skipping threads. Then switch to the fine grit stones to give an even sharper edge.
Coarse grit stones will dull an already sharp blade to prepare it for the fine stones but will not produce an edge that is capable of cutting.