MSI PRO B660M-A DDR4 Manuel D'utilisation page 18

6. Put the M.2 SHIELD FROZR heatsink back in place and secure it.
For M2_2 slot
1. Secure the supplied M.2 standoff according to your M.2 SSD length if need.
2. Insert your M.2 SSD into the M.2 slot at a 30-degree angle.
3. Secure the M.2 SSD in place with the supplied M.2 8.5H screw.
8.5H screw
3
Standoff
1
6
2
30º 30º
17
6