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. Our burs are the finest in quality at very reasonable prices and your satisfaction is guaranteed. This 12PC Bud Bur Assortment includes 1 each of the following sizes: 0.80, 0.90, 1.00, 1.40, 2.10, 2.50, 2.90, 3.30, 3.50, 4.00, 4.50 and 5.00mm. Packaged in a hang-up reusable pouch that keeps cutting heads apart.