Bergeon's nine screwdrivers on a rotating stand is the industry standard. Screwdrivers in sizes 0.50, 0.60, 0.80, 1.0, 1.2, 1.4, 1.6, 2.0 and 2.5 millimeters. Includes an extra blade for each size in the center storage compartment. Each screwdriver is color coded. Screwdrivers have knurled grip shafts and swivel heads so that when you hold the top with one hand, you are able to easily twist a screw out with the other hand. The blades are changed by using the set screw at the end of the screwdriver. The revolving base conveniently holds the screwdrivers in color coded slots and the spare blades in the center. Swiss made.