I have amassed a collection of various screw sizes over the years, but they are low quality. I finally had enough when putting up a hook and when screwing in my old screws, the head stripped off in a few turns. I had to get pliers and manually unscrew them. This box contains screws of different sizes, all in a easy to store and see box. I have put up she new shelves with these and they went in, not head stripping, no jumping screwdriver. A good buy for the toolbox.