CARBIDE COUNTERBORE - 13/16" (20.64mm)Use for counterboring upper joints on Bb soprano clarinets for installation of any of our pre cut center tenons. The carbide tipped cutters are brazed to a hardened alloy steel body and will far outlast and outperform counterbores made from high speed steel, especially when cutting on the highly abrasive plastics used on most instrument bodies. Requires a 3 16" (4. 76mm) counterbore pilot and a pilot bushing. Made in the U. S. A. Diameter: 13 16" (20.
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