Abstract: An upper closure member 11 for a tubular vertical railing member 10, or associated post member, comprising, an upper viewable portion 12, when located on the tubular vertical member 10 or a railing or associated post, in use. A lower portion 13 sized to be accommodated within the tubular vertical member 10 or associated post member. The lower portion 13 comprises an expandable member 16 located to, or formed with, the lower surface of the upper portion, a bolt member 14 attached in screwthreaded engagement with a lower part 13 of the upper portion 12, whereby actuation of the bolt member 14 via the interior of the tubular vertical member 10 or associated post member causes expansion of the expandable member 16 to positively locate the expandable member 16 within the vertical railing member 10 or associated post member.