The structure uses a number to indicate the proportion of abrasive material in a grinding wheel, known as the abrasive ratio. A rating of 6 signifies a 50% abrasive ratio, with each lower number increasing the ratio by 2%, and each higher number decreasing it by 2%. Consequently, a rating of 5 represents a 52% abrasive ratio, while a rating of 7 represents a 48% abrasive ratio.
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