Ladder-Lock is a ladder conversion kit designed to increase the safety of its users by improving an extension ladder’s overall stability. Compatible with most 16 to 24-foot extension ladder models with hollow rungs, the product significantly decreases the users' chances of injury. The Ladder-Lock features two adjustable legs that connect at the ladder midpoint and two adjustable arms that anchor to the ladder’s lowest rung, creating four points of contact that eliminates kicking out, sliding and tipping, supporting more weight than a ladder alone.