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binifiMux 300pcs M3 Knurled Threaded Inserts, Brass Female Press in Embedment Heat Set Nuts Assortment Kit for Laptop 3D Printer Plastic: Amazon.com: Industrial & Scientific
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Amazon.com: uxcell Knurled Threaded Insert, M3 x 3mm (L) x 5mm (OD) Female Thread Brass Embedment Nuts, Pack of 100 : Industrial & Scientific
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M3 Threaded Insert, Stainless Steel Threaded Inserts For 3D Prints - Walmart.com