Set of 12 Burs in various sizes-- These are used to set stones with your flex shaft!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. Each set contains the same shape burs in various sizes. The hang-up reusable plastic pouch keeps cutting heads apart and takes up very little storage space.