The MDMAS is the short arm module of the Allcam MDM0X series (MDM04, MDM05, MDM06, MDM07) LCD monitor/TV Desk Mount brackets. If you want to modify or enhance the MDM05, MDM06, or MDM07 desktop mount bracket, or want to configure your own desk mount bracket, then the arm module is an essention parts. The arm module has a hole at one end and an axis at the other end, and the axis will fit into the hole of another arm module so you can easily extend the total length of the desk mount bracket.
The arm module are available in two lenghts: short 125mm and long 184mm. You are buying one piece of short arm module. You can click Long Arm for MDM0X series LCD monitor Desk Mount Braket for the longer version.
Please note these MDMAS arm modules are NOT suitable for MDM1X series desk mount bracket (MDM11S, MDM12D, MDM12Q), those models need the MDM10AL arm modules.