All metal 4-Bladed enlarging easels. Features heavy gauge spring steel blades. Precision designed guide rails made from aluminum extrusion, ensure accuracy. Masking blades are detachable for individual arrangement. Unique silver-gray finish makes it easy to compose the image before inserting paper. Also includes three sided measuring scale, free moving blade carriage with securing lock, dual spring-loaded hinge and unique white viewing strips which aid in cropping and composition.