Armstrong stocks Busch and Fox brand cup burs. Busch brand cup burs are available in a wide range of sizes, from 0.8mm up to 5.0mm. Fox are available in sizes from 1.0mm to 2.9mm.These tungsten vanadium steel burs are made to ultra high precision tolerances. Sizes under 4.0mm are sold in packages of six only-sizes 4.0mm and above are available individually.

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