Baldwin 1046 4.5" x 4.5" NRP Ball Bearing HingeThe Baldwin 1046 NRP is a 4. 5" x 4. 5" Ball Bearing Hinge with standard corners and a non removeable pin. Ball Bearing Hinge is machined for precise installation and smooth movement. This hinge has non removable hinge pins, used primarily on exterior doors (or any door that needs to be locked) that has hinges that are visible from the outside. Ball Bearing Hinge is beveled on the inside leaf to obtain a tight fit when viewing the hinge in a closed