Transform your 3D printing projects with these precision-engineered M3 heat set threaded inserts. Each pack contains 100 brass knurled nuts measuring M3x4x4.5mm, perfect for creating strong, reliable connections in plastic parts and 3D printed components. These inserts are designed for easy heat installation, allowing you to create durable threaded connections that won't strip or pull out under normal use. The knurled exterior ensures excellent grip within the plastic material, while the brass construction provides long-lasting durability. Ideal for makers, hobbyists, and professionals working with 3D printed parts, these inserts offer a clean and professional finishing solution for your projects. The M3 thread size is compatible with standard M3 screws, making them versatile for various applications. Simply heat and insert these brass nuts into your plastic components for a secure, permanent mounting solution.