DW4524 Type 27 Wheels: Masonry Cutting and Grinding - DEWALT There is silicon carbide grain for long wheel life in all masonry materials and high grain concentration for aggressive grinding action and smoother running wheels. The proprietary wheel design ensures durable long life wheels. Features 3 full sheets of glass in every 1/4" wheel and 2 full sheets in every 1/8"wheel for added durability and safety.