This adapter allows you to use an M2 NVMe SSD in a PCI Express slot. It has no bracket and is only attached via a PCIe slot. It comes with screw and notched post; The M2 SSD is inserted into this slot and you screw the spacer to the board. This allows different sizes of SSDs to be used; I use this with a 22110 SSD and it fits perfectly. It has an activity LED that is visible through my case, at least in my case. Given that 1) it works, 2) it supports a variety of M2 SSD sizes, and 3) it's fairly cheap, I give this device five stars.
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