Review on 🔧 10Pcs 3mm (1/8") Shank Long Double Cut Tungsten Carbide Burrs Rotary Files Diamond Burs Bit Set for Die Grinder Rotary Tool, 4-Inch Length - Yakamoz by Chris Fisher

An example of the size of a file. I pulled out one that looked like it would fit for what I needed to do. Insert the rotary file into the rotary tool until it stops. Set the speed to the minimum. When I switched it on, the instrument almost jumped out of my hand due to the vibration. After that I stopped using other rotary files to protect my rotary tool and myself. I might try cutting the file to minimize vibration and offset some of the cost of the bits. They look sharp but are either poorly balanced or have a bent shaft. Couldn't use them.