According to ISO 5468, diamond-ground carbide special cutting edge with high tungsten carbide content and homogeneous fine grain structure, point angle 120°, asymmetrically shaped drill spiral for optimum drill dust transport, drill insert with high contact pressure and a recommended speed of 800 - 1.000 rpm without impact, suitable for cordless and corded machines, color green, specialist for hardest stones such as granite, gneiss, slate, basalt, concrete, but can also be used for glass, ceramics or roof tiles and other hard materials.