Description: UL listed for panic exit hardware. Devices are ANSI A156.3 - 2008 Grade 1. The 3347A has a grooved mechanism case. The concealed vertical rod device is non-handed except when the SS (signal switch) option is used. 3347A fits door stiles as narrow as 2- 1/8 (44mm) wood door stiles as narrow as 4 (102mm). Newly designed device has a one-piece center case cover.