This mount is designed for a double slot and screw 2.5" SSD mount bracket.
Most of the brackets out there are 2'5" to 3.5" adapters, but we are entering the era of more SSDs out there than small platter drives. Most modern cases have cutouts for mounting 2.5" drives right next to the MB mounting area and this mounting adapter will support the slot and screw kind as shown in the cover photo.