Feature: 1. Multiple Sizes for Various Needs: This heat set insert tip offers 7 different sizes, including M2, M2.5, M3, M4, M5, M6, M7, M8, which are commonly used in 3D printers for melting copper nuts or for inserting nuts into plastics. 2. Compatible with a Range of Soldering Irons: These insert tips are designed to be compatible with a variety of soldering iron heads such as 900M and T18. They can be used with for SREMTCH, for Hakko, for LONOVO, for RHAEGON, for WaxRhyed and other brands. 3. Designed for Perfect Installation: This tool set is specially crafted for the insertion of heat set inserts into 3D printed parts. Each tip perfectly matches its corresponding insert, making the installation process easy and ensuring a smooth and clean fit. 4. Quick and Easy Swap Over: Featuring a male female head design and a hand twisted knurled joint, these tips set can conveniently be disassembled and swapped over with different threading tips, even in their cooled state. 5. Superior Material for Enhanced Performance: Constructed from brass, these insert tips offer excellent heat conduction. They enable direct end face contact, preventing nut skewness and assisting with the quick and efficient insertion of nuts into plastic parts. Specification: Item Type: Heat Set Insert TipMaterial: BrassThread Size: M2, M2.5, M3, M4, M5, M6, M7, M8Application: Fit for 936 T18 ST 900M FX888D FX600 WLC100 Soldering Iron Heads. Package List: 1 x Connector 7 x Soldering Tips 1 x Plastic Box