Lyman's Bag Jack is designed to make it easy to adjust the elevation of your rifle and bring it into line with your target, while also allowing you to maintain a comfortable shooting position. It corrects the height with a simple turn of the adjustment knob. The lift is made from sturdy aluminum and steel components and has a non-slip textured platform. It is 10" x 10" so it can accommodate the largest size rests, and collapses for unmatched portability.