Those nibs locate the lens in the chromed steel ring that holds the lamp in place, IIRC. I drove in the UK and Europe from 1981-2002, and do not recall ever being nearly blinded by vehicles coming in the opposite direction. I have driven here in the USA since 2002, and every night I am constantly blinded by vehicles coming the other way, some of it is caused by those ghastly mega-bright HID lamps, that don't seem to have any focus, other than directly ahead, and in my opinion should be banned, (are you listening BMW and Audi?) And then there are all the pick-up trucks, many with lift kits that place the beam directly in line with my rear view mirror, (there are laws about headlamp beam height here, but they are ignored) Then there are the people with one lamp out, or one lamp way out of adjustment pointing at the sky. But notwithstanding all of the above, the actual capsules are differently made, so they do not seem to have any kind of cut off to avoid blinding other drivers, unlike in Europe, where they do. Europe, and especially Germany seem to be streets ahead in headlamp and capsule technology. I like Philips extreme in my headlamps and Osram Night Breaker Plus, both excellent capsules, both made in Germany, I believe. Leon