usually camber screw is used when the car has aged,where the lower arm,knuckle,absorbers especially has run outa specs causing negative camber angles causing the tire position maybe more than 0degrees which will cause premature tyre wear in the inside in most cases,its a good item if u wana maintain ur tyre 4 along time,the cons is that this screw is quite fragile and nt robust as the standard steel kingpin,which makes safety a question.certain cars is unable to adjust camber so this screw is helpful bt most car manufactures do not allow camber adjustment.Most proton cars and perodua do nt have camber adjustment for the front wheels.