Dyscar valve stem extensions appear to be of good quality and add aesthetics to a motorcycle or other vehicle when used on a four wheel tyre. means of transportation. I wanted to use an extension to make it easier to check the spare tire air pressure on my 2019 F-150. The valve stem is accessible when the spare tire is folded, making it difficult to read the pressure and/or adjust the air pressure. Many of the extension cords studied were larger and significantly more expensive. Dyscar valve expanders of various angles have worked for my purpose. However, they are relatively small and impractical to use in restricted areas. I then did the work with a 135 degree extension. Assuming they hold pressure over time I would recommend them for use in applications where a little elongation will do the trick.