NOTE: The holes where the arm attaches to the magnet are not threaded. The screw will self-tap the hole and create the threads when inserted for the first time.
This is the Short Size Arm of the Sagework Umbra guitar support. It includes both moving parts of the arm, the thumbscrew and its washers.
I have owned the standard Umbra support for a while now and needed to go to a lower playing position. It is convenient that Sagework sells various arm lengths separately so one can change the support to your own personal preferences. The arm I received had a manufactures defect but Geoff had a replacement in the mail immediately so I thank him for solving the problem quickly.