Camel CGW brand 4 1/2" diameter high performance grinding wheels are made of Zirconia and Aluminum Oxide grain, allowing for faster and smoother grinding as well as an extra long wheel life.  Available with a depressed center (Type 27), 1/4" thickness, 5/8" arbor with a hub.   ZA24T bond design.  Grain Size:  Course    Grade:  Hard  Applications:  Great for steel, cast iron and stainless steel.  For angle grinders.