These adapters are a game changer for my industrial electrical work .After I put them to the test I was amazed at how easy it was to convert my lighting components to fit other fixtures. The precision and sturdiness of each adapter impress me and make me feel confident that they will last for a long time. Industrial and Scientific. The only downside is that it would be great to have more variety in the package, but the included 10 pieces are definitely useful..