Precision 1/2"-28 UNF brass threaded heat set inserts by Initeq (Durathread series). Designed for strong, reusable threaded connections in 3D printed parts, plastic housings, and soft materials. Simply heat with a soldering iron and press into a pre-drilled hole for a permanent brass thread. The tapered design and precision knurl pattern allow plastic to flow between the ridges, creating an exceptionally strong bond. Imperial 1/2"-28 UNF thread.