These cup burs are made of the finest Swiss-milled Vanadium steel for long life and accuracy. All burs are total length of 44.5mm with 3/32" (2.35mm) shanks for quick-change handpieces. The Eurotool burs are the finest in quality at very reasonable prices and your satisfaction is guaranteed. This 12 piece Cup Bur Assortment includes 1 each of the following sizes: 0.90, 1.00, 1.20, 1.40, 1.50, 1.60, 1.80, 2.00, 2.30, 2.50, 2.70, and 3.00mm. Packaged in a hang-up reusable pouch that keeps cutting heads apart.