This TALL version of the adjustable arm of the Sagework Atlas (formerly Barnett Original) guitar support. It includes both moving parts of the arm, the thumbscrew and its washers.
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.
I purchased the extended arm assembly and found it very useful for my needs. Having some physical limitations, it allows alternate positions for my guitar as needed.