After trying this assortment of screws i must say that I`m thoroughly impressed. As a DIY enthusiast, I've used various screws over time, but none match up to this set. The screws are sturdy, the assortment is comprehensive, and the price is reasonable. You get screws of different lengths and sizes to cater to your project needs.The only con is that the screws are only suitable for internal use. Overall, a great purchase for anyone in need of top-notch screws for their industrial and scientific projects..