Metalworking shops around the world have come to rely on long lasting 3M Cubitron II depressed center grinding wheels to deliver a fast cut on a variety of metals. Now we're taking productivity a step further. With the introduction of our new Type Q wheel. You get the same great performance as our original Type P wheel but with a harder construction, for greater wheel durability and longer life. These cool cutting wheels are ideal for heavy grinding and weld removal and are specially formulated for use on stainless and mild steel. If you need a wheel that can really go the distance, ask your distributor or 3M rep to try new Cubitron II depressed center grinding wheels Type Q - today!. Unlike other wheels that are extremely hard but slow cutting, new Cubitron II Type Q wheels deliver the same fast cut and smooth running feel as our original P hardness wheels but now, with even greater durability and longer life!.