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 hand pieces. Our burs are the finest in quality at very reasonable prices. Each set contains the same shape burs in various sizes. The wood stand provides convenience on the bench as well as storage.