Bihui Professional Grind Diamond Cup Wheel Disc | BHDCWD55 inch (125mm) professional diamond cup wheel disc for aggressive grinding Dual row diamond design for fast material removal and surface preparation Air holes maintain a cool, stable cutting pattern and reduce wear Suitable for grinding, smoothing, and removing adhesives and materials Works on concrete, granite, sandstone, and other building materials 22. 23mm borehole, maximum RPM of 12,250 for efficient performance Durable and long lasting