http://tinyurl.com/ms46u57
Vulcan Ladder USA ES-17T11G1 17-Feet Multi Task Ladder
The Most Versatile Ladder on Earth - 23 Possible Configurations with Height Adjustments in One Feet Increments
Step Ladder, Extension Ladder, Stairway Ladder, Wall Ladder and Scaffold Frames - All in One Compact Design
Patented No Pinc h Hinge for Ease of Use and Safety
Wide Base for Added Stability
Built from Strong Aircraft Grade Aluminum