Posts and rails of any material can be used for the installation of brush fencing panels.  However our standard 'offset' system uses 50 x 50mm square galvanised steel posts and 25 x 38mm rectangular steel galv rails (sizes as used in the iron fencing industry).

'Three-hole-plate' brackets are fixed to the posts with 'tek' screws and the rails cut to fit between the posts and are fixed to the plates (also using tek screws).

The bottom rail is fitted in line with the 3rd to bottom panel wire so that the panel wire can hooked and fixed from the front, to the rail behind using tek screws.  The top rail can either be fitted in line with the top panel wire for similar fixing with screws or above the top panel wire if the roll top is to cover the rail.  In the latter case the roll top and roll wires secure the panel to the rail rather than being screwed to the rail.

(with the alternative 'inline' installation system, no bottom rail is used in that case, as the panel wires tension around the posts at each end )