VIEWSONIC VP3881a 37.5" 21:9 4K Curved IPS Monitor - Manual (Page 13)

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5. Attach the mounting bracket to the VESA mounting holes at the rear of the
monitor. Then secure it with four (4) screws (M4 x 10 mm).
100 mm
100 mm
6. Follow the instructions that come with the wall mounting kit to mount the
monitor onto the wall.