220pcs Brass Heat Set Insert Nuts for 3D Printing M2 M2.5 M3 M4 M5 M6 Knurled Threaded Inserts for Plastic Resin Models

220pcs Brass Heat Set Insert Nuts for 3D Printing M2 M2.5 M3 M4 M5 M6 Knurled Threaded Inserts for Plastic Resin Models

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