Rough grit can be 30/40 and fine grit can be 400# or finer according to requirement.
It has a common electroplated bond diamond grinding wheels feature with high precision, good sharpness, and variable sizes. Need sample order of 1A1, 1F1, 1EE1, 1V1, please go to our aliexpress store link xhdiamond.com or leave a message for more customized grinding wheels.