ShineNow Heat-set Insert Tips for T18 ST 900M FX888D FX600 WLC100 Soldering Irons to Install M2 M2.5 M3 M4 M5 M6 M8 Heat Set Inserts - Amazon.com
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