Similar to ultrasonic inserts, these inserts are applied into a pilot hole after the molding process is complete. Unlike ultrasonic inserts, these inserts can be applied with pressure, whether that comes from a hammer, a finger or other equipment. Post-molded inserts come in a variety of styles depending on the material into which it will be inserted. Some have flanges or heads. Most fall into two rough categories; 1) those that are split along their length and provide stability through expansion and 2) those that are ribbed externally.