One set (one hex stand-off and one screw) for mounting an SSD into an open space on a Gigabyte or MSI Motherboard.
Use this set when you have an open thread on the motherboard - like shown in the '42' space in the image here - and screw this spacer in, place the SSD, then use the M3 screw to attach it.
Note, normally the Gigabyte supplied screws are M2 size, so you can't mix these - only use this set as a pair and they'll work fine together.