Double sided hollow grinding is used for blades of kitchen and steak knives, hunting and sports knives, pocket knives, and handtools e.g. saw blades
This type of machines utilizes 2 cup wheels, each wheel at an angle of 45° to the blade. This arrangement results in an consistent hollow bevel shape over the entire wheel life. Depending on the thickness of the blank, the bevel width, and edge thickness required, a grinding wheel with a suitable inside diameter and wall thickness is chosen so that the resulting outside diameter corresponds to one of the readily available sizes.