Dremel 1-1/2'' Premium Metal Cutting Wheel features the EZ506CU cutting wheel, which is enhanced with a super abrasive grit known as cubic boron nitride (CBN). This advanced material allows the cutting wheel to stay sharp much longer, maintain a cooler temperature during use, and resist shrinking. Based on internal testing, the EZ506CU cutting wheel lasts at least 20 times longer than Dremel's standard fiberglass-reinforced cutting wheels. This means you will spend less time changing wheels, save storage space for s, and reduce costs by needing fewer wheels. Designed for use with the EZ402 EZ Lock Mandrel, accessory changes are quick and easy with a simple pull, twist, and release mechanism, making your cutting tasks more efficient and convenient.