A set of 12 Busch 3-in-1 Twincut Cup Burs in a range of sizes from 0.8mm through 2.0mm. It's called a 3-in-1 cup bur because it shortens, rounds, and polishes in one easy step. Twincut geometry features Dual Chip Channels that permit a more rapid removal of excess material. There's no need for multiple passes to allow for chip removal because of the Chip Channels. And as the bur rounds the article being worked, it polishes at the same time. Thinner cup walls make it easier to work on tightly spaced prongs. Made in Germany. 3⁄32" shanks.