Features: This versatile 5 piece set, including three collet chucks and two nut, offering seamlessly chucks conversion for trimming and engraving machines, effortlessly accommodating both 6mm and 1/4" (8mm) router bit shanks to enhancing tool adaptability. Crafted from high strength carbon steel, the durability collet chucks and nut ensuring reliabled performances and compatibility with various woodworking tools, providing long lasting resistance to wear. Ideal for enthusiasts and professional woodworkers, this essential accessory set caters to those seeking efficient upgrades for their engraving and trimming equipment. Perfect for precise applications in furniture making, decorative carving, and detailed engraving projects, it simplifies bit changes and boosts machining versatility. Elevating your workshop efficiency with this router bit shank adapter, designed to streamlines tool setups and deliver consistent accuracy in woodworking tasks.<br/ Specifications: Component: Carbon Steel Hole Diameter: 6mm/6.35mm(1/4")/8mm Size： As Pictures Package Includes: 1Set Engraving machine nut chucks note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.