Why Adjustable? Full door length adjustment means doors that can be squared accurately and easily in new installations, existing frames can be used in retrofit applications, and maintenance staff can make future adjustments of the door. Utilizing the Adjust-A-Screw™ fasteners on Markar hinge systems permits up to 3/8" adjustment on the hinge side. An adjustable lock-edge fastening system allows an additional 3/8" total width adjustment for stainless steel edge guards and a 1/8" total width adjustment for aluminum edge guards – providing more flexibility in retrofitting and maintenance. For a more detail explanation, download The Markar Advantage.