With this kit you can repair the headlight aiming adjustment screw if the knob is missing. You will receive a kit with 2 nuts. The smaller one is installed onto the screw first. After the second nut is installed, it should be tightened against the first nut, as shown in the picture... and the repair has been completed.

Volvo 240 1986-1993 European and US market models

You will receive 2 nuts with the kit. These are custom-made parts. The screw that is shown in the picture is not included