This Pro-Line marker post (vendor part SD-11424, Millennium Part #527874) is a custom-designed utility marker post manufactured to a specific customer print file for identifying buried fiber optic cable and other underground utility lines. Deploying clearly marked posts along a route helps utility locators, excavators, and telecom crews confirm line location before digging, supporting damage-prevention compliance. Built from durable, weather-resistant materials for long-term outdoor exposure, this marker post is stocked as part of Millennium's Marker Posts & Signs category, serving fiber, gas, and utility contractors nationwide.