Made of the finest Swiss-milled Vanadium steel for long life and accuracy. This set includes 0.8, 0.9, 1, 1.5, 1.8, 2.1, 2.5, 2.9, 3.5, 4, 4.5, and 5mm burs. Each bur is 1-3/4" long with a 3/32" shank.