Stackable adapter spacers with cables holes for mounting Architect® Blue and Architect® One Blue mullion readers.
External dimensions for Architect® Blue readers:101.6 x 53.8 x 57.15 mm ( 4'' x 2.11'' x 2.23'') / Between-center distance: 83.3 mm (3.27'').
External dimensions for Architect® One Blue mullion readers:101.78 x 42.17 x 6 mm (3.97'' x 1.66'' x 0.24'') / Between-center distance: 72 mm (2.83'').
You can also stack bases to space the reader from the wall.