Diablo, 4" x 1/4" x 5/8", Type 27, Premium Masonry Cut-Off Disc, Provides Superior Performance & Increased Productivity, Premium Aluminum Oxide Blend, Cut Through Material Faster Than Other Cut-Off Discs & Extra Long Cutting Life, Fully Reinforced For Use In Hand Held Cut-Off Work, Ideal For Use When Working In Hard To Reach Areas.