The set of diamond grinding nails includes sizes of 5mm (2.35mm rod) and 6mm (3mm rod) and 8mm (3mm rod) and 10mm (3mm rod) and 12mm (3mm rod) and 14mm (3mm rod) and 16mm (3mm rod) ,1x each, please check the size before installation. When installing a new tool, be sure to test whether the tool jumps. If it jumps, it cannot be used directly. It must be adjusted so that it does not jump before it can be used. Otherwise, the tools will wear out quickly and the carved things will not be very smooth. Adjustment method: Use a small wrench for changing the chuck and gently tap the high-speed rotating tool handle until the tool is stable. It is strictly forbidden to knock the electronic machine. The adjustment method is to loosen the chuck, turn the tool at an angle or extend and retract a little. Be sure to cool it with water, such as dry drilling. The diamond on the tool head will be graphitized due to overheating and will wear out quickly., Manufacturer: OTOTEC