The Ergonomic Solutions EET029-02 is a mounting bracket for xCase, listed for use with an e355 M-case Mount. It is an accessory for mounting an xCase in that setup, with the specific intended use tied to the exact part number.
The bracket is listed in black, giving it a simple, understated appearance alongside the mounting assembly. This is a focused mounting accessory for the stated xCase arrangement; the confirmed listing does not specify additional fittings or package contents.