This product is either discontinued or we cannot get that from suppliers.
Atdec AWM-P51-B 510mm Post Add To Existing AWM Configurations Accessory, Color: Black, Material: Aluminium, 10 YRW.
The AWM-P51 is a part of the Atdec modular family. It’s a popular option in modular configurations due to the height flexibility. Suitable for single, dual and triple display configurations mounted in one row.