6 The rings to be gapped fit on the grinder like you see here. Wiseco recommends grinding only one side of the ring. That way to keep a factory edge to make sure the other one remains square. Push the end of the ring against the side of the grinding wheel with only moderate pressure and spin the wheel counterclockwise so it grinds from the outside edge of the ring toward the inside. This is important to keep the coating on the face of the ring from flaking off near the ground edge.