1Size Details: The total length of the set is about 49?63mm, the shank diameter is about 6mm (1/4inch), the outer diameter of the tip is about 8mm/0.31in. 2 Materials: The single cut burr set is made of tungsten carbide with heat treated process, the hardness can reach HRC70. 3Wide Application: The cemented carbide cutting burr set is very suitable for fine detail work, and widely used in metal products, woodworking, model engineering, jewelry making, welding, etc. 4Match to Use: Generally can be used with hand?held electric or pneumatic tools with the speed of around 6000?50000rpm, also for machine tools (the above is not included). 5High Performance: The burr file set is with ten times higher than the durability of high speed steel cutters, and more than 200 times higher than small grinding wheels, has a long service life.