Extron EWB 101 External Wall Box One Gang Black 60-1161-02 Architectural solutions for wall mountable Extron products Designed with 2.5" depth to house the wiring of a faceplate and take in cable runs from a surface-mounted raceway or rear wall space Knockouts for external raceway cable channels 4.50" H x 2.75" W x 2.50" D (1 gang)