Extend a USB 3. 0 Motherboard Header into Two Panel-mount USB 3. 0-A Ports. The USB3SPNLAFHD 2-Port USB 3. 0 to Panel mount USB cable features a 20-pin USB 3. 0 motherboard header connection on one end, breaking off into two separate USB 3. 0-A (female) ports on the other end of the cable. The USB 3. 0 panel mount cable offers a convenient solution for connecting bootable thumb drives or authentication fobs etc. to the motherboard USB 3. 0 connection.