RS Self Assembly Posts. These great value, versatile posts from RS come in an easy to use, self-assembly kit which is easy to transport to the required location and can be assembled there. The base is supplied empty and when filled with 2.5 litres of water provides a sturdy base weight. The post is assembled using the individual coloured post sections and topped with a ring which can be used to support a chain. Additionally, the post can support an information sign. Features and Benefits. Compact, easy to assemble bollard kit Multiple posts can be used together and will support a chain fixing Easy to take apart and store