Evolution Cyclone HSS Premium Grade Annular Cutters Evolution standard geometry is sufficient for most drilling applications. Manufactured specifically to maximize hole accuracy while minimizing cutter vibration and extending annular cutter life. Using this standard geometry enhances accuracy and saves time. This allows for a single ejection of slugs when drilling through stacked material. Pack of 1 WARNING: This product can expose you to Lead, a chemical known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov - Lead