300 Pcs M3 Heat Inserts M3 x 4mm x 5mm Brass Threaded Inserts 3D Printing Knurled Metric Nuts for Plastic, 3D Printing Components

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300 Pcs M3 Heat Inserts M3 x 4mm x 5mm Brass Threaded Inserts 3D Printing Knurled Metric Nuts for Plastic, 3D Printing Components