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. This burs are the finest in quality at very reasonable prices. This 12PC Setting Bur Assortment includes 1 each of the following sizes: 1.00, 1.20, 1.50, 1.70, 2.00, 2.20, 2.50, 3.00, 3.50, 4.00, 4.50, and 5.00mm.