This Busch Cup Burr has a 2.35mm shank that can be used with most pendant drills and micromotors. The external diameter of the cup is 0.90mm and the internal diameter is 0.63mm.
Busch 411 Cup Burr (Concave Cutters) have cutting teeth on the internal of the cup and are used by stone setters to trim the claws on rings. This burr is made from high quality tool steel.
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