Webtrex signature® railing components. Choose trex signature® aluminium posts (which include a cap and skirt) for steps 1 & 2 and pair. Can be used in combination with all. See specific installation instructions for attachment of trex post mounts or trex joist mount posts prior to installing any railing. Cutting post sleeves is not required. Web1 rails also compatible with composite trex post components. 2 signature aluminum railing with round aluminum balusters is only available in charcoal black. Webtrex signature railing is available in a variety of colors and configurations. Choose from traditional vertical aluminum balusters, clean and contemporary glass, industrial mesh or. Webtrex signature railings are designed to be attached with posts installed at a clear span of 6' (1. 83 m) or 8' (2. 44 m).