Width/Diameter: 2 Height: 2.5 Depth/Extension: 2 - Desc: Minimal 1-1/2 diameter 2-1/2 deep. Can be installed in a range of locations. Access to back of ceiling is not needed. INSTALLATION Mounts to Tech Lighting a��s special cylindrical 11/2 diameter 21/ 2 deep junction box (included). Access to back of ceiling is not needed. If wall mounting head should be no longer than 6 . OTHER For use with remote transformer and any Free Jack pendant or head (sold separately). - - Accessory - 2 FreeJack Port Alone Satin Nickel Finish -