Centerless & Cylindrical Wheels provide a long, wide surface with no center mounting support (hollow). They can be very large, up to 12 in width. They are used only in vertical or horizontal spindle grinders. Cylinder or wheel ring is used for producing flat surfaces, the grinding being done with the end face of the wheel. Centerless and cylindrical wheels are used for general purpose deburring and blending. They are commonly used on ferrous alloys, high-tensile materials and wood.