There are many types and models of grinders and grinding machines, and since
these also effect the shape of the workpiece, there are an extremely large number
of grinding wheel shape types. The name for the standard shape type of grinding
wheels and symbol for the standard rim type of grinding wheels are stipulated in
JIS R6211 "Shapes and Dimensions of Grinding Wheels". The outline
of these is indicated here.
For more information, please take a short look at
grinding wheel's size.