I wouldn't normally write a review for a $5 product, but this caused a lot of inconvenience. I installed them on a horse trailer that we use regularly. In preparation for a longer trip (4 hours drive) I check my tire pressure as usual. I had 5 installed including a spare. Three came off with difficulty, the other two had to take a grinding wheel and CAREFULLY turn the cap without grinding the threads on the valve stem itself (standard brass stem). Thank goodness I wasn't out and had a flat tire that couldn't be fixed as the spare itself was one of those I couldn't remove. DO NOT buy these caps. They can fuse with your valve stem threads. I run tires on all my vehicles, be it highway or farm use, and valve covers are something I regularly take off and put back on. I won't buy this again.
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