Don't worry, I'll excuse this blatantly ignorant question just this once ... lol jk
What it does is this ... if you were to be drinking soda with a straw, and half way up you would cut holes in the straw, it would be wayy wayyy hard to get soda passed those holes wouldn't it .... trust me it can save you're car.
It's really easy to make it fit on our cars. Just let me know when you buy it.