The saddle can be mounted on the PCB, to easily eject printed circuit boards from rails or to place them safely again. You must determine the location of the saddle on the PCB depending on the profile of your rail and ejection force.
For this purpose, a borehole of 2,8 mm must be provided in the right place. You can then mount saddles on the printed circuit boards by pressing the supplied steel pin with a pair of pliers or press into the saddle on the printed circuit board.