Diablo, 4.5" x 1/2" x 7/8", Premium Dual Metal Cutting & Grinding Discs, Provides Superior Performance & Increased Productivity, Premium Aluminum Oxide Blend, Cut & Grind Through Material Faster Than Other Discs & Extra Long Life, All-In-One Disc Allows You To Cut & Grind Simultaneously, Fully Reinforced For Use In Hand Held Cut-Off Work, Ideal For Use When Working In Hard To Reach Areas.