A casing member for assembly with an opposed identical casing member to encase a post includes an elongate body portion having spaced apart first and second side edges extending lengthwise of the body portion. First and second connectors are adjacent the first and second side edges respectively, and extend lengthwise therealong. The first connector includes a first tongue protruding from the body portion along a tongue axis. The second connector includes a groove bounded at least partially by spaced apart first and groove second sidewalls joined to the body portion. The first groove has a groove axis parallel to both the groove sidewalls and the tongue axis. The first tongue is inter-engageable with the first groove of the opposed identical casing member and the first groove is inter-engageable with the first tongue of the opposed casing member so as to secure the two casing members together about the post.