I bought these to use as a stop indicator in my garage for my wife. As I do a bit of hobby work also, these give me a place to safely run cables from one side of the garage to the other when needed.
The quality seems good and they interlock nicely. The covers flip open and close easily. You can drive over them with a regular car with no issues. It is noted heavy vehicles and parking directly on top of them is not recommended.
A heavier version of them is available if you need the added strength to stand up to a heavier load.