Virtjoule Heat Set Insert Tips for Sizes M2, M2.5, M3, M4, and M5 - Soldering Iron Tips for 3D Printer Users, 3D Printing Accessories Compatible with Hakko FX-888D and Weller SP40NKUS Soldering
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Amazon.com: [initeq] M3-0.5 Threaded Heat Set Inserts for 3D Printing (100, Short) : Industrial & Scientific