I bought these at the same time as a similar product from GRK - https://www.amazon.com/gp/product/B000I19B74 It's #7 and the GRK screws are # I didn't care about 8 values. They don't compare well. When working with an electric screwdriver, more time/force is required to "click" compared to the GRK. The torx bit will slip out easily, removing the head in the process. Good torx screws shouldn't come out, but they do (unlike GRK screws). If you are careful and patient they will work, especially on softwoods. If you work with hardwood and are willing to pay more, you will see a noticeable difference in quality when you switch to a GRK product.