33A and 35A for all types of single and double doors with mullion, UL listed for Panic Exit Hardware. Devices are ANSI A156.3 – 2001 Grade 1. The 35A has a smooth mechanism case and the 33A has grooved case. The rim device is non-handed except when the SS (Signal Switch) option is used. 33A/35A fits door stiles as narrow as 1 3/4″. Hex key dogging standard. Device Lengths: 3′ 2’4″ to 3′, 4′ 2’10” to 4′.