Grinding tool for edge circular processing

A grinding tool comprising:

• a profile wheel including a semi-conical first profile wheel having an edge with a substantially concave grinding surface and a semi-conical second profile wheel having an edge with a substantially concave grinding surface asymmetrical to said first profile wheel, the first and second profile wheels are fixed to a spindle of a rotary electric or air tool such that the grinding surfaces are opposed to each other so as to form a substantially semi-circular concave grinding surface that is an outer peripheral face;
• a guide plate having an edge, rotatably mounted on the spindle, the edge of the disk guide plate is configured to contact a reference face of a grinding object material surface to guide the grinding object in a grinding direction, the guide plate has an outer diameter larger than the maximum outer diameter of said profile wheel;
• and
• a stopper ring rotatably mounted on the spindle between said first profile wheel and said second profile wheel configured to control a grinding distance Y from the edge by bringing an outer peripheral end face thereof into a contact with the edge of said grinding object material, wherein
• said profile wheel, said guide plate and said stopper ring are fixed with a lock not to the spindle of said rotary electric or air tool.