Compatible with Makita model 3612, not compatible with other models. The size is 12.7x20x26.5mm, which is perfectly suitable for 1/2-inch engraving machines, ensuring a stable connection between the chuck and the tool. Made of black metal material, it has good corrosion resistance and wear resistance, ensuring that it is not easy to wear or rust after long-term use. The chuck nut design provides strong clamping force, ensuring that the engraving machine tool is firmly fixed, improving the safety and stability of use. The simplified nut design makes the installation and replacement process quick and easy, and users can complete it without complicated operations., Manufacturer: eMagTech