I'm not really a fan of these they don't feel as safe to use as the other ones you can get with a plastic sort of coca cola/caramel coloured handle, however, decent for the price.
Bought these and have been using them for over 6 years on my car. I damaged one of my side mirrors which caused one of these to break so I had to replace it with the circular ones. The circular ones are so much better because they are bigger, their angle can be easily adjusted by rotating once placed and this adjustment stays put. These ones can be tilted to adjust the angle but it doesn't necessarily stay put due to the wind during driving. The one I have on my driver's side I have to push back in everyday because it flips out thanks to the wind whilst driving; this isn't necessary with the cheaper and better circular ones. So save yourself some money and buy a better product.