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 8PC 45 Degree Large Size Hart Bur Assortment includes 1 each of the following sizes: 3.30, 3.50, 3.70, 4.00, 4.20, 4.50, 4.70 and 5.00mm. Packaged in a hang-up reusable pouch that keeps cutting heads apart.