GilaTools 4" Single Row Diamond Grinding Cup Wheel 5/8"-11 Threaded Engineered from high quality military grade hardened steel to provide 100x longer use than other conventional diamond cup wheels Diameter: 4 inch Arbor: 5/8"-11 Threaded Diamond Grit: Coarse (Aggressive). Engineered with industry balance technology to improve machine vibration during application. Application: For less rough concrete and masonry surface.