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.