What the description tells the panel builder
The description — PB 2POS MOMTRY 44MM MSHRM YLW — breaks down as a panel-mount pushbutton with a 44mm mushroom head, two positions (typically push-to-actuate, twist-to-release or key-release), momentary action (spring-return), and a yellow operator. The 44mm head is oversized for gloved-hand operation or emergency-stop applications where visual prominence matters.