From the Manufacturer
This heavy-duty fiberglass flat D-rung extension ladder has a 375 pound duty rating (Type IAA). This ladder has a maximum working length of 21-feet. Guides at the top and bottom of the ladder securely interlock rails for safer use. The base and fly sections separate, so the base section can be used as a single. The ladder rungs are riveted at four points on each side to allow for rung replacement. It also uses the patented Alflo rung joints for Twist-Proof performance. Other features include interlocking side rails, slip-resistant Traction-Tred D-rungs, and pre-pierced holes for easy field installation of accessories. This model is not equipped with rope and pulley.
Product Description
ANSI Type 1AA; Extra heavy-duty: 375 lbs.; Slip-resistant Traction-Tred® D-rungs; Exclusive Alflo® rung joint means Twist-Proof® performance; Single pulley system; Mar-resistant end caps;