Copper Core Blind Hole Plastic Rubber Head Six Star Nuts M4-M12 Black Plastic Nut Good Quality Thumb Nut. Customizable Color: Available in Black with colorable options to meet specific requirements. Customizable Size: Size can be customized according to customer specifications. Diverse Material Options: Constructed from PP, ABS, PA, Iron plated with White Zinc, or SUS304. Tool-Free Hand Tightening: Designed for convenient and quick installation without tools. OEM and ODM Services: Full customization, minor customization, and flexible customization available. Fast Delivery Time: Estimated delivery within 7 days for standard orders. Comprehensive Quality Inspection: 100% visual and function inspection for all finished products. Multiple Thread Standards: Available in Metric (M4-M12) and Imperial (10#-2') thread sizes.