A tribute to the legend, half a century of crowned glory. TO CELEBRATE THE 50TH ANNIVERSARY OF THE MAIDEN BRAND, THIS LIMITED EDITION COLLECTIBLE TOOL IS LAUNCHED. Engraved with the honorary mark \"50TH UNIVERSAL\", it is not only a performance tool, but also a metal history book engraved with half a century of craftsmanship. Double standard accuracy, global standard. Body length: 120 mm / 4.72 inches (accurately corresponds to the metric and imperial dual system). Key components: 45 mm / 1.77 inches (strictly adheres to international general specifications). Full mirror polishing treatment, edge chamfering process to achieve millimeter precision card position. Multiple application scenarios. Industrial grade accuracy testing: the preferred measurement benchmark for precision machining. Engineer collection gift box: with walnut display stand to highlight professional identity. Laboratory standard reference: constant temperature steel to ensure zero error in thermal expansion and contraction. Vocational and technical training: visual display of standardized work specifications.