DEWALT 4-1/2 x 1/4 x 7/8" Type 27 Masonry Grinding Wheel is designed with a silicon carbide grain that ensures long wheel life in all masonry materials. It features a high grain concentration for aggressive grinding action and smoother running wheels. The proprietary wheel design s durable, long-life wheels, making it an excellent choice for both professional and DIY projects requiring reliable and efficient grinding performance. Model Number: DW4524