Ultrasonic - Installed by pressing the insert into the mounting hole with ultrasonic insertion equipment while simultaneously applying a high frequency vibration. Frictional heat caused by the vibration melts the plastic surrounding the insert allowing easy insertion. More... When the vibration ceases, the plastic solidifies, locking the insert permanently in place.Heat Staking - Installed by pressing the insert into the mounting hole with a thermal press to melt the plastic surrounding the insert. Less