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 12 piece burr set is made from high quality tool steel. This Busch Cup Burr Set have shanks that are 2.35mm shank that can be used with most pendant drills and microcomotors.
These burr set is manufactured from a high quality tool steel to provide a precision cut and long working life. As with all burrs and cutting tools, we recommend the use of a light lubricating oil or silicone lubricant to prevent overheating and maintain sharpness of the burr.
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