Using this product, you can extend the USB 3.0 19P that comes with the motherboard into one for two (20pin holder, empty one pin is also called 19Pin). 1 to 2 USB 3.0 female screw mount panel type to motherboard 19pin/20pin flat cable. You can use USB 3.0 type-A female convert USB3.0 (20pin Header) directly connected to the motherboard. The USB 3.0 A female connector can screw at the panel. USB 3.0 port switch to USB 3.0 19 pin/20pin cable.there are screw mount holes at USB 3.0 female end. and high quality Item: Motherboard USB 3.0 19Pin/20Pin Cable Colour:As Shown Material:plastic Size:Length: about 20cm Package Contents: 2 x USB 3.0 19Pin/20Pin 1 to 2 Splitter Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.