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This USB extension kit comes with a full metal PCI slot bracket equipped with four screw-fixed USB2.0 female ports, connecting via internal cable to motherboard common USB2.0 9Pin front-panel header. It makes full use of idle PCI slot to add extra rear USB interfaces for desktop and industrial equipment, solving insufficient onboard USB shortage efficiently. Compact structure saves installation space, widely used for office PC upgrade, industrial control computer modification and legacy mainboard interface expansion.