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After use, grinding wheels can start to get grooves worn into what is supposed to be a flat surface. They also have a tendancy to collect bits and pieces of the material that is being ground. This is build-up of material is dangerous. Material such as steel expands more when it gets hot than the grinding wheel does, and when this "loading" of material occurs in the porous surface of the stone, and gets hot, it can cause the grinding wheel to fracture. This tool is rested on the rest of the grinder while the grinder is running, and the wheels with the offset teeth are pressed into the stone. As they come in contact with the surface of the stone, they clean and re-surface or "dress" the wheel. It's a grinding wheel dressing tool.
 
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