Busch Cup Concave Bur. Cutting blades inside the bur make it an excellent tool for the finishing of claw settings. Made of tungsten vanadium steel for strength and durability. Teeth are precision machined and uniformly spaced so cutting is accurate and smooth. The Jewelers' bur, standard of the trade. Use with ProCut bur lubricant # 19928 to extend bur life and cutting. Shank measures 3/32", approximately 1-3/4" long. #77B
Priced per piece, 10% discount for 6 or more burs.
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