PCle 4.0x4; 64G/ Support PCle4.0, backward compatible with PCle3.0&PCle2.0 Support M.2 NGFF M-KEY NVME protocol; support M.2 NGFF B-KEY SATA protocol (requires motherboard to support SATA protocol) Support M.2 2230, 2242.2260.2280 length ports and SSD and devices Support hard disks: hard disks and devices that support NVME&SATA protocols Support systems: for Macos//Linux the colors of screwdriver, screws, and studs are random , don't accept the specified color Different batches may have different screen printing/appearance, but it will not affect the use Colour:Black Material:PCB+FPC Package Contents: 1 x extension cord 1 x screwdriver 2 x screws 2 x studs 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.