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. 45 Degree Hart Burs: 0.90, 1.00, 1.20, 1.30, 1.40, 1.50, 1.60, 1.70, 1.80, 2.00, 2.10, 2.30; 12 pack.