Designed as a practical job site accessory, this ladder jack is built to work with steel plate surfaces and mountable on either side of extension ladders for quick setup and teardown when working with scaffolding platforms. The refined design includes a safety screw that prevents the jack from slipping off the ladder, protecting both users and stored items during all work tasks. Left and right groove details boost overall stability and weight carrying capacity, and it pairs with 20 in. wide platforms that meet official OSHA safety standards. Adjustable to fit round or "D" rung ladders, it works with most standard extension ladders, and can be used on either interior or exterior ladder faces. Ideal for tasks like painting siding, window repairs, and general maintenance, this welded trapezoidal ladder jack requires two units for proper use across a range of scaffolding platform setups on job sites.