Home Accessibility Stairs Helical stair Helical stair Description Save Structural drawing of the 450º helical staircase (5/2pi radians). Format DWG File size 272.38 KB DOWNLOAD DWG share your appreciation Related Posts Stairs Stairs 2 sections mixed ladder l-shaped staircase Steel emergency stairs plan stair detail Stair blocks for homes Footing – stair Stair details Details of ramps - stairs 2 section ladder concrete staircase Leading metal ladder Development metallic spiral staircase d=1.80 drawings of stairs Double Escalator, Plan View and Side Elevation metal stairs with wooden steps Colonial blacksmith railing 3d stair detail