Amabur A610-10 Best Rotary Tool Tungsten Carbide Rotary Burr Set 1/8 Inch Shank 10-pieces (Single Cut) Rotary burr: the shank 1/8 Inch Rotary burr set :Cutting edge diameter: 1/4'' (6mm) Carbide rotary file Suitable material: wood, plastic, soft metal as aluminum... amabur carbide rotary burr Industrial levels - high quality material, not easy to damage