PT.TEC.B1.25.3.200.40.X.R3 | 2.5mm PMMA/PEEK Bur for VHF* Machines (1-Flute Ball) 2.5mm 1-Flute Ball Carbide Milling Bur for PMMA/PEEK FLATCOAT® TEC Coating, Shaft Diameter of 3mm, Spring Ring.