"The upper part is composed entirely of aluminum- even the adjustment knob.
This gives the M7 a quality feel and impressive looks, both of which will
certainly be appreciated in an office/executive type setting. The knob pictured
here is all that is needed to keep the post's gas strut in place once a proper
monitor height has been reached. I was impressed to notice that even the
internal post, which is the end of the gas strut and will not be seen under
normal use, is made of polished aluminum."