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【936 Universal Soldering Iron Tips】The heat set insert tips are interchangeable with standard 936 general purpose soldering iron tips for use with M2 (M2.5 common), M3, M4, M5, M6 (1/4 inch), M8 and other hot melt nuts or inserts. It can meet your different needs. 【Brass Material】Heat set inserts are made of brass for better thermal conductivity and face to face contact to prevent nut skewing and facilitate quick insertion of nuts into plastic parts. They are commonly used for 3D printers to print parts with hot melt copper nuts or to implant nuts on plastic. 【Practical Change System】Due to the thread in the soldering iron adapter, the soldering tips can be changed very easily. This set is a great addition to a 3D printer toolbox as it offers a wide size range for flexibility in picking the most appropriate insert you need for each 3D printing project. 【Easy To Use】The small distance embedded in the pressed head avoids the plastic parts, so the head is not easily damaged to the plastic parts, and can be inserted into the plastic parts to a certain depth. These tips reliably and efficiently release the thermoset pins from the soldering iron. 【100% Satisfaction Guarantee】We are so confident in the quality of these 3d printer soldering tips that we offer a warranty or refund for them. If you have any questions about your purchase, please feel free to contact us. We will resolve your issue within 24 hours.