100 Truss Base Plate 1A BP3OPTI Trilite 100 Series Bases and End Accessories provide clean strong protective bases and clean finishes to OPTI Trilite 100 truss systems. There is a wide variety of standard OPTI Trilite 100 and display components available for use with the 1 inch main tube OPTI Trilite systems. The OPTI Trilite 1A BP3 is a round cornered 200mm square 4mm thick aluminium plate with three base plate spigot connectors welded at 90 to it for use with OPTI Trilite 100