5pcs/pack Dental Carbide Burs Bits High Speed FG558 Ø1.2mm 6 Blades Fissure por | Jul 19, 2026These are Friction Grip (FG) Burs for high speed hand-pieces. Stronger one piece Bur is concentric and allows for less vibration and fracture. If there is a problem, we can work together to resolve it.