StarTech.com ARMDUAL3 User Manual page 14

If the Mounting Surface's thickness is between 10 mm - 50
mm:
Align the two upper Screw Holes on the Upper Desk Clamp
4.
with the two Screw Holes on the Lower Desk Clamp.
Insert the two Desk Clamp Screws through the Screw
5.
Holes on the Upper Desk Clamp and into the Screw Holes
on the Lower Desk Clamp.
Using the 4 mm Hex Key, tighten the two Desk Clamp
6.
Screws. Being careful not to over-tighten the Desk Clamp
Screws.
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C-Clamp Assembly
13