... of tungsten carbide for finishing gold, other metals and acrylic plastic material Dental Carbide Burrs1.6mm shank, tungsten carbide ... Numbers, 220), the green circle, mainly used for scraps of acrylic resin large plates and gypsum. -2. Teeth (ISO Numbers, in ... Lord for scraps fragile and difficult to scurf cemented carbide, acrylic - resin and ceramics4. Very fine tooth (ISO Numbers, 141), yellow ...