The AM-110 bracket is used to mount the AL-200 leveling plate (included with our spectroradiometer) and can be mounted to a mast or pipe with an outer diameter of 1.3 to 2.1 inches. This product was previously used as the mounting bracket for all other Apogee radiation sensor leveling plates besides the spectroradiometer, but those sensors now use the new AL-120 integrated leveling system.