Specification: Item size: 4.5 * 2.3 * 1.8cm / 1.77 * 0.91 * 0.71in(L * W * H) Item weight: Approx.11g / 0.39oz Package size: 11.5 * 8 * 1.8cm / 4.53 * 3.15 * 0.71in(L * W * H) Package weight: 11g / 0.39oz Features: You can use this adapter to convert the USB 3.0 type-A socket to USB3.0 (20pin Header) directly to the motherboard. Two USB3.0 ports to one USB3.0 20pin. Expand two USB3.0 A Female Ports from your 19pin USB3.0 pin header. Super speed USB 3.0 cable 5Gbps data transfer rate.