Arm diameter is 2.

Replacement LCD FOR A02B-0163-C322. The pre-cut mounting slots ensure that the installation WILL be easy and straight forward. The package includes following items. 1 piece of 14 inch industrial LCD screen with mounting bracket. 1 piece of video signal adapter cable. Power supply with power cord. It is time to replace your old CRT monitors with the new high quality LCD industrial monitors. If the monitor you need is not in my store, just ASK! UPS overnight service is available, choose UPS overnight when you check out. Thank you for supporting American small business!