Architectural door hinges full mortise 4 holes per side - plain joint - stock standard weight steel f series - clf179 class gray prime coated size 4 inch by 4 inch packed with wood screws and machine screws. Standard grade, five knuckle architectural hinge used commonly on light-duty, low-frequency internal or external door applications in commercial and residential buildings, such as hospitals, churches, schools, airports, hotels, malls, apartment houses, office buildings, etc. Equipped with easily seated non-rising pin, Templated screw-holes. Patterns for use on wood or hollow metal. Exceeds ANSI standards, meets ANSI a8133. Each 4 inch by 4 inch hinge includes 8 -10-24 by 1/2 inch machine and 8 -10 by 1 inch wood screws.