Features: SFF 8639 to PCIE X4 adapter card, designed for seamless compatibility for NVME SSDs. Crafted from durable metal material, this adapter card features a hollow design for excellent heat dissipation, ensuring stable and reliable operation even in extreme temperatures. PCIE interfaces is compatible for motherboards of X4/X8/x16 card slots; Thick gold-plated electric shocks are in close contact with the motherboards interfaces, reducing hard disk usage failures, run smoothly; SFF-8639 to PCIE X4 expansion card PCIE X4 to .2 risers card SFF 8639 PCIE GEN3 SSD converter; Specifications: Material:Metal Size:Approx.12x12x8.5cm/4.72x4.72x3.35in SFF-8639 to PCIE X4 Support NVME SSD; Compatible for Motherboards of X4/X8/X16 Card Slots Package Includes: 1x SFF-8639 to PCIE X4 Adapter note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.