17', Aluminum, Type IA Multi-Purpose Ladder, 300 LB Duty Rating, Advance Heavy Duty Ergonomicy Duty Polymer Spring Loaded L-Locks, Quick Activating Snap Lock Hinge, 1 Man Set Up, Heavy Duty Locking Pins, Multi-Positioning, Meets OSHA, CSA & ANSI Standards, Will Work As A 4'-7', Step Ladder, 9'-15', Extension Ladder Or 1'-3', Scaffold, Extra Wide Flared Bottom For Stability, Features A Telescoping Design For Maximum Versatility.