This Extension Plate has pre-drilled holes for the AMPS hole pattern. This allows additional holders to be added to existing mounts. It features up to 5 positions in either portrait or landscape orientation. Additional holes allow for cables to be run through the plate for a clean installation. Extension plate allows an additional device holder to be added. Multiple Locations for AMPS hole pattern mounts. Made from durable steel. 11.8 in (30 cm) x 2.36 in (6 cm) x .12 in (3 mm)