These ultrasonic inserts for plastic are perfect for providing a threaded hole in thermoplastics. To use, install these heat-set inserts using an ultrasonic horn, heat driver, or soldering iron to heat them up and melt the insert into the thermoplastic. As the thermoplastic cools, it will solidify around the insert, holding it in place. Items vary by length, thread type, number in a package and other considerations. For more on inserts, see our full selection of thread inserts.