Werner 20 in. Aluminum Ladder Jacks are lightweight yet sturdy, designed to provide maximum support and stability by spanning two rungs. These ladder jacks fit both round and flat step rungs and can be mounted on either the inner or outer front faces of ladders. Adjustments are quick and easy thanks to the convenient wing nut lock. The long body design accommodates stages and planks up to 20 inches wide, making them versatile for various tasks. These ladder jacks are UL listed and labeled, for use with 300 lb, Type IA extension ladders, and are also compliant with OSHA and ANSI standards for use with 250 lb, Type I extension ladders. Each package contains one pair of ladder jacks, providing reliable support for your work projects. Model Number: AC10-20-02