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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.