Excellent for the money. When your valves are flat, they work best. Mine were hollow so they didn't last all that long, but I had some "twists" before they came loose and kept coming loose. I ended up wrapping a few turns of tape around the end of the valve stem and using a drill that wasn't too tight on the end of the valve and twisted it back and forth that way. I'm glad to have them in my tool collection.
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