Black Plastic Thumb Nut M4/M5/M6 Round Head Bakelite Knob Nut. Customizable Color: Available in Black with colorable options for specific requirements. Customizable Size: Size can be customized to meet specific application needs. Diverse Material Options: Constructed from PP, ABS, PA, Iron plated with White Zinc, or SUS304. OEM and ODM Services: Full customization, minor customization, and flexible customization available. Tool-Free Hand Tightening: Designed for convenient and quick installation without tools. Fast Delivery Time: Estimated delivery within 7 days for standard orders. 100% Quality Inspection: All finished products undergo visual and functional inspection. Flexible Customization: Customization available from samples, designs, or full specifications.