The Mortise Alignment Plate is used with all PRO-LOK mortise installation Installation Templates to center the template on a door with the mortise pocket already cut out. Made from lightweight aluminum, featuring steel hardened bushings and an anodized finish. The Mortise Alignment Plate is used with all PRO-LOK mortise installation Installation Templates to center the template on a door with the mortise pocket already cut out. Made from lightweight aluminum, featuring steel hardened bushings and an anodized finish.