I currently have set up with 24" monitors. Could work with smaller monitors as well.
Has two horizontal arms, each with three VESA mount - each VESA mount has holes for largest and smaller VESA sizes
Middle VESA mount is fixed upper and lower, the VESA mounts for side monitors are sliding so can take various monitors.
have original manual and various parts / tools (see photo)
Walmart has at 120 new, 4x my price
https://www.walmart.com/ip/VIVO-Hex-LCD-Monitor-Desk-Mount-Stand-Heavy-Duty-Adjustable-6-Screens-up-to- show contact info
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VESA mounts allow for tilt up and down, using an allen key