5748078-1 is an HDP-20 shielding hardware enclosure kit designed for D-subminiature connectors with shell size 3 and 25 contact positions. The kit features a steel connector shell with tin plating, a 94V-0 rated thermoplastic insert in black, and a steel tin-plated shield with PVC black enclosure and zinc alloy jackscrews. The connector dimensions are 1.660 inches (Dim. D), 2.210 inches (Dim. E), and 0.630 inches (Dim. F), with a recommended cable outer diameter range of 0.217 to 0.435 inches and a maximum inner cable bundle diameter of 0.350 inches. This kit is ideal for industrial machinery, medical instrumentation, computers, and storage systems requiring reliable shielded connectivity with robust environmental protection and EMI shielding.