Why did I choose this rating? I chose 5 stars because I really don't want to drive without it anymore. What did I like or dislike? it's so much easier because the caps are sometimes pressed close to the stems. I also use them to pump water out of my reverse osmosis system because the shaft is very short and surrounded by plastic so it was almost impossible to find a suitable pump other than a portable bike pump which was difficult to use for this purpose . Now I can use the floor pump. They're metal and haven't shown any signs of flexing or wear, and I don't expect them to. They are easy to remove and easy to screw on. If I could change anything they might be too long for me to keep on my car but that's not a big deal as they are easy to put on and take off. Who would I recommend this product to? Recommend this to anyone who needs a small Schrader valve extender and wants something that will last and doesn't look cheap.