SUPER B Professional Crown Race Cutting ToolHeavy duty and high quality machining tool is for milling both the outer edge and lower surfaces of the crown race seat, ensuring a smooth, accurate cut and proper alignment of the fork in the frame. Includes 4 cutters and 2 guides for: 26. 5 mm and 27. 1 mm crown race seats on 1" forks. 30. 1 mm crown race seats on 1 1 8" fork. 39. 8 mm crown race seats on the tapered fork with upper 1 1 8" and lower 1 1 2".