Heat-Set Insert Installation tip for #4-40 and M5 Inserts Compatible with Hakko FX-888D and Weller Irons with ST Series Tips (SP40NUS). Used for Connecting 3D Printed Parts.: Amazon.com: Tools & Home Improvement
QLOUNI 330Pcs M2 M3 M4 M5 Female Thread Knurled Brass Threaded Insert Embedment Nut Assortment Kit, Pressed Fit into Holes for 3D Prints and More Projects: Amazon.com: Industrial & Scientific