This product is a carbide burr tool with an egg-shaped head and 8 flutes. It has a cutting diameter of 5/8" and a cutting length of 1.25". The shank diameter is 1/4". The tool does not have any coating and is not a custom bundle. It is made in the United States and is not modified. The abrasive material used is carbide. This product is suitable for metalworking and CNC manufacturing.