Phoenix Contact 0821483 A blue marker or label sheet with no pre-printed information can be customized to mark a specific area on a terminal block by using various Blue Mark labels such as BLUEMARK ID, BLUEMARK ID COLOR, BLUEMARK CLED, PLOTMARK, CMS-P1-PLOTTER, and BLUEMARK E.CARD. The labels are designed for use with latching mounting and fit terminal blocks of 6 mm width, featuring an 80-labeled sheet layout that accommodates text fields measuring 5.2 mm in height and 5.45 mm in width.