Insert # 80125A16-21BR | Molded-In Closed End Threaded Inserts
M10 x 18mm Threaded Screw In Inserts for Plastic Self Tapping Zinc Plated | eBay
ruthex 1/4" Threaded Inserts - 20 Pieces RX-1/4“-20x12.7 Brass Heat Set Insert for Plastic Parts - Inches knurled Nuts - Insert by Heat into 3D Printing Components: Amazon.com: Tools & Home Improvement