Master carton: 52*46*104cm,4pcs/ctn
Height adj.: 450-990mm
Arm length: φ28*345mm
Tube size:25*25mm

It is designed with strength and comfort in mind.  It utilizes an ergonomic trigger, an internal rod mechanism and a solid-steel spring-loaded deadbolt assembly. Simply squeeze the ergonomic trigger to disengage the clutch, position the stand at any of its convenient height adjustments. and release the trigger to re-engage the clutch.
Rubber end-cap also keeps it non- slip. single-x keyboard stand