GilaTools 5" T-Segmented Diamond Grinding Cup Wheel 7/8"-5/8" Arbor Non Threaded Engineered from high quality military grade hardened steel to provide 100x longer use than other conventional diamond cup wheels Diameter: 5 inch Arbor: 7/8"-5/8" Non-Thread Diamond Grit: Coarse (Aggressive). Engineered with industry balance technology to improve machine vibration during application. Application: For rough concrete and masonry surface.