The 80.010.4525.0 is a marking strip accessory designed for labeling and identifying DIN rail terminal blocks, such as those of the fasis WKIF 2.5 series. Constructed from Polyamide 66/6, this strip features black figures on a white background for clear visibility and can be snapped into the 3-chamber slot on top of compatible blocks. It is designed with a 5 mm spacing to suit 10 terminal blocks in a row. This accessory provides a clear and organized method for circuit identification in junction boxes and control panels, with custom marking available upon request.