http://www.profaceamerica.com/22mm
Pro-face America's GP-4000M Series HMI with 3.5 and 5.7 in LED-backlit LCDs has full graphics, a TFT touchscreen interface with serial or ethernet connectivity. The operator interface is installed using a 22 mm thread through a common hole size used for pilot lights or push buttons. These models are programmed with Pro-face GP-Pro EX development software.