2d plan of spiral staircase cad blocks in AutoCAD, dwg file.

<p>This Architectural Drawing is AutoCAD 2d drawing of 2d plan of spiral staircase cad blocks in AutoCAD, dwg file. Spiral glass stair,&nbsp;<strong>mostly constructed with a central steel column</strong>, has glass threads connected throughout its height. The treads can be either round or angular or adjusted according to the wall shape.</p>