Widely compatible: wet/dry, compatible with 4.5inch angle grinder, suitable for concrete, marble, masonry grinding, glue and epoxy resin Product size:concrete grinder wheel 4.5 Mandrel 7/8inch with 5/8inch and 4/5inch reducer washers. More stable operation at high speed (13,300 rpm supported) Technology upgrade: -grade 1500°C high-temperature triple quenching and sintering process, high-purity is more closely integrated with the matrix, and the service life is extended by 300% Product design: high-purity 18 teeth, double-row staggered cutter heads, friction coefficient as low as 0.15, grinding efficiency increased by 50%; Eight cooling holes are self-dissipating and clogging, and the debris diameter is only 2.5 microns, reducing the risk of friction and overheating Safety: Heat-treated steel structure, the tool section and the substrate are more firmly combined to the safety of high-speed operation, Weight: 0.75949249259 pounds, Manufacturer: Wesafrae