The Werner d5920 is made of fiberglass to offer the best in flat heavy-duty D-rung extension ladders. The rating for this extension ladder is Type II, which means it has a capacity of 225 pounds. Its maximum length for working is 17 feet.
For your safety this Werner d5920 extension ladder comes equipped with guides at both the bottom and top, to make sure that the rails are securely interlocked. It also offers the Werner patented alflo joint on its rungs that keep the extension ladder from any twisting safety issues.
Additional safety features of this d5920 include side rails that interlocks, slip resistant runs, and direct connection between rail and rung. There is neither a rope nor a pulley with the Werner d5920 extension ladder.
One thing to keep in mind whether you consider a Werner or any other fiberglass extension ladder is that fiberglass, while durable and sturdy is heavy. This was mentioned as the biggest drawback by one online reviewer and owner of the Werner d5920. If you're ordering online, therefore, you'll want to look for free shipping.