This Louisville aluminum industrial extension ladder has a 300 pound load capacity. It is equipped with the MAXLOCK rung lock, custom engineered from a patented, advanced molecular polymer, MAXLOCK is the strongest, toughest, lightest rung lock ever made This ladder also includes the patented QuickLatch RungLock system that provides a simple, intuitive method of securing the fly and base sections of the ladder when extended. This ladder also features outside slide guides, D-shaped rungs fully serrated for a slip resistant surface, mar-resistant rail end caps, full I-beam for a more stable connection and to prevent twisting, and swivel safety shoes to be used as tread down or in spike position.