Premium Grade Blue Zirconia Alumina.   Includes a special grinding aid added for faster and cooler stock removal.   These discs can be used on any steel but are compounded to work on harder metals and alloys.   Size: 3";24.<p> <b><b><img src="https://contestimg.wish.com/api/webimage/5a539d9b3f0f5b6f324aeefb-original.jpg></b></b></p>