Diablo, 4-1/2" diamond cup wheel for masonry. Diablo's diamond cup wheels provide extreme durability, faster cuts and longer life in concrete grinding applications. These superior performing diamond cup wheels deliver up to 3 times faster material removal versus standard diamond cup wheels. Extra-wide slots provide maximum dust extraction while the l-shaped diamond segments avoid gouging and swirl marks. Industrial-grade diamonds deliver lasting durability and maximizes quality in extreme applications.