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Hilitchi 460 Pcs M2 M3 M4 M5 Female Thread Brass Knurled Threaded Insert Embedment Nuts Assortment Kit, Embed Parts, Pressed Fit into Holes for 3D Prints and More Projects: Amazon.com: Industrial &
10pcs M8 x M5 x 10mm Self Tapping Threaded Insert Nuts 302 Slotted Type Screw Bushing for Thread Repair: Amazon.com: Industrial & Scientific
Amazon.com: [initeq] M5-0.8 M5 Threaded Heat Set Inserts for 3D Printing (20, Short) : Industrial & Scientific