This 17-piece set in wooden case contains every screwdriver size you will need for precision work, along with spare blades for each in a separate container. Both the handles and the containers are color coded for easy organization. Your purchase includes 12 flat screwdrivers in sizes 0.5, 0.6, 0.7, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, 2.5, and 3.0 millimeters; five Phillips screwdrivers sizes 1.4, 1.6, 2.0, 2.5, and 3.0 millimeters; and 51 spare blades.