ZT.DIA.B2.25.3.200.48.X.R4 | 2.5mm Zirconia Bur for Amann Girrbach* Machines (2-Flute Ball) 2.5mm 2-Flute Ball Carbide Milling Bur for Zirconia FLATCOAT® DIA Coating, Shaft Diameter of 3mm, Metal Ring.