I have a triple-monitor stand made of 1/2" steel pipe. My previous mount would let the monitors slowly droop to aim at the floor. I designed this mount to keep a firm grip on the steel pipe and allow my displays to stay where I aim them.

The bracket has four captive M5 nuts so that your monitor is held up by more than just threads in plastic. The clamps also take four M5 screws, I used 16mm long ones.

The display will use four M4 screws, length may vary by manufacturer. Mine were 20mm long.