Features: This Tips head for the screw which Inner diameter 2/2.5/3/4/5/6mm. Suitable for most of frequently used Heat melt nut in 3D printing parts working. Our heat set insert tip set ensures seamless and clean embedding of threaded inserts into plastic, forming a new, fastenable thread. The split design allows you to easily switches between tips of different sizes without unscrewing the sleeve of the soldering iron. You can easily replace the tip by simply unscrewing the old tip and installing new. Due to the ideal geometry of the tip, the risk of damaging the surfaces around the threaded insert is effectively reduced. Protect the results of your hours of careful printing. Specifications: Component: Copper Size: as shown in the picture Package Includes: 6pcs Insert Soldering Iron Tip Head (2mm, 2mm.5, 3mm, 4mm, 5mm, 6mm, 8mm) 1pc 936 Adapter 1pc C245 Heat cores note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.