Electrical Insulation Plastic Knob Nut Bakelite Thumb Nut 4mm Round Knurled Head M4/M5m6. Customizable Color: Available in Black with colorable options for specific requirements. Custom Size Options: Size can be customized to meet specific application needs. Tool-Free Hand Tightening: Designed for convenient and quick installation without tools. Durable Material Selection: Made from PP, ABS, PA, or Iron Plated with White Zinc/SUS304. Versatile Thread Sizes: Supports M4, M5, M6, M8, M10, M12 metric and imperial sizes. OEM/ODM Service: Supports full customization from samples, designs, or minor adjustments. Strict Quality Control: 100% visual and function inspection before packing. Fast Delivery: Estimated delivery time within 7 days for standard orders.