1. Diamond alloy files are made of diamond and substrate electroplating with fine grains, sharp, wear-resistant, high-strength and good wear resistance.2. Ergonomically designed plastic handle, anti-slip and comfortable hand feeling. There is a hanging hole at the bottom of the handle for easy placement.3. For grinding, polishing, engraving, cutting and filing glass, ceramic, metal, jade, stone, and cemented carbide. suitable for garages, factories, engineering, workshop and DIY use.4. Notice: Suitable for hard metals, not for soft metals, such as aluminum, copper, gold, etc. When filing, use wire brush to remove the debris on the cutting teeth.