Features: brand new and high quality Made of high-quality high speed steel materials, practical and durable. Suitable for white skin removing, polishing for wood and jade, etc. Applicable for fine carving of resin, plastic, porcelain, soft metal, stone, etc. It can replace small emery wheels, high efficiency, the processing efficiency is higher several times than hand tools. The cutting direction should move smoothly from right to left, do not need too much force,prevent the impeachment and impact. High processing quality, file smoothly, can process out various shapes of mold cavity. Long life, easy and simple to use, safe and reliable. Specifications: Material: High Speed Steel Shank Diameter: approx 6.35mm/0.25 inches for Head Diameter: approx 13mm/0.51 inches Total Length: approx 65mm/2.56 inches Shank Length: approx 40mm/1.57 inches Note: 1.Please allow 1-3cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 5x/Set Rotary File Grinder Set