These screws are really good. I would buy them again and in different sizes. They are lightweight and appear to be quite durable. I was expecting the shaft to be a bit stiffer. I've disabled one outlet so far, but the driver wasn't the best I've had, so take that with a grain of salt. I like the product. They are used to hold a racing quadcopter at speeds in excess of 60mph and will not break. I think it says something. Many Thanks.