1U 10" rackmount, 4-bay SSD drive mount , 4-slot 2,5″ HDD/SSD rackmount.

This is a 10 inch rack mount bracket for 4x 2.5 inch SSDs, designed for homelab, NAS or Raspberry Pi rack builds.
The mount fits standard 10″ racks and allows easy airflow and cable management.

I sneaked a holder for a USB dongle in there. This fits a Coral edge TPU. for your Frigate NVR.
It will probably hold a lot more dongles.