Apple VESA Mount Adapter Kit for 24/27 iMac or Thunderbolt Display MD179ZM/A
This is for use with Apple Thunderbolt Display, Apple LED Cinema Display, 24" iMac (Aluminium), and 27" iMac (Late 2009, mid 2010, early 2011). Compatible with VESA FDMI (MIS-D, 100, C) compliant mounting solutions.