Heat Insert Nut Iron Tip for 3D Printer Thread Sizes: M2, M3, M4, M5, M6, M8 Suitable for plastic 3D printer soldering irons. Size: Approx. 2.5 x 0.4cm / 0.98 x 0.16 inches Material: Brass Features: Brand new and high quality. A variety of connectors for embedding different M2 (M2.5), M3, M4, M5, M6 (1/4") melt nuts. Hand-twisted knurled joints allow for easy disassembly and replacement of threaded inserts while cool. Metal material ensures excellent heat conduction, preventing nut skew and enabling quick, convenient embedding into plastic parts. Our indenter is embedded at a slight distance after pressing to avoid damaging the plastic part. The head is designed to prevent damage and allows for insertion to a specific depth. Lightweight and compact for easy storage and handling. Package Includes: 1 Set of Insert Tips Note: 1. Please allow 1-2cm errors due to manual measurement. 2. Due to differences between monitors, the image may not reflect the actual color of the item.