Pferd Burr Set, High Performance, 5 Piece, Aluminum/Non-Ferrous Cut, Tungsten Carbide Head, 1/4 in Shank Diameter.Pferd tungsten carbide burs are designed for machining materials of virtually any strength. They are manufactured in compliance with the highest quality standards. Pferd 26550 High Performance Burr Set, Aluminum/Non-Ferrous Cut, 5 pc