Beautifully made precision screwdrivers in nine sizes: .019", .023", .031", .039", .047", .055", .065", .078" and .089" (.50, .60, .80, 1.00, 1.20, 1.40, 1.60, 2.00 and 2.50 mm) with an extra blade in each size in center compartment. Swivel heads and knurled handles with set screws to keep blades tight. (Packs of 10 replacement screws: 30080/X .50mm, 30080/Y .60-1.60mm, 30080/Z 1.80 - 3.0mm)