Three times faster than a standard concrete grinding cup wheel - Grinding large concrete surfaces has always been time-consuming and therefore expensive. The Expert Concrete is faster than a Bosch Benchmark diamond cup wheel: This is achieved by integrating Diamond Technology into the latest design innovations. Dust accumulation in conventional concrete cup wheels prevents them from showing their full efficiency: The L-shaped grinding segments on the Expert head are optimized for effective removal of surface material. This material is immediately directed into the large slots, ensuring quick dust extraction. For anyone needing to grind large concrete surfaces: The Bosch Expert Concrete cup wheel saves time and money while delivering a highly professional result. With a bore diameter of 22.23 mm for concrete grinders and angle grinders with a clamping nut. Imbalance, max. gmm: 50, diameter mm: 125, bore diameter mm: 22.23, segment height mm: 4.5.