MSI B450M-A PRO MAX II Micro-ATX Motherboard - Manual (Page 29)

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M2_1: M.2 Slot (Key M)
Installing M.2 module into M2_1 slot
1. Please install the supplied EZ M.2 Clip kit according to your SSD length.
2. Insert your M.2 SSD into the M.2 slot at a 30-degree angle.
3. Rotate the EZ M.2 Clip to fix the M.2 SSD.
30º 30º
3 3
1 1
2 2