Dura-Green DIA - WH6 wheel HP, 2/Pk. Vitrified bonded diamond abrasive. Densely packed diamonds are embedded throughout (from the surface to the core) in a special glass binder offering extended cutting ability. Easily contours, better than carborundums. Improved cutting, reduced chipping. Clean cutting & no metal residue. Use Dura-Green DIA stones for: Zirconia, Lithium Disilicate, IPS e.max, BruxZir & Hard Alloy.