Syama Prasad Mookerjee Port, Kolkata (SMPA) hoisted Kolkata's highest national flag at Netaji Subhas Dock on a 60-metre (197-foot) monumental flagmast under the Har Ghar Tiranga initiative.Key Details of the InstallationFlag Size: An imposing 30 ft × 20 ft national flag.Structure: A continuously tapered, hot-dip galvanised, 20-sided polygonal high-tensile steel shaft on an RCC bored cast-in-situ pile foundation.Operation: Controlled via a motorised double-drum winch system with a designed lifespan of 25 years.