Features: Includes three hinges (3) in each order Features precisely machined Square 5/8 radius corners Tested for residential and commercial strength application Features a removable pin allowing you to easily remove your door without having to uninstall the hinges. Packaged with wood screws for simple out of the box installation Constructed with 8 screw holes in an zig zag arrangement for maximum mounting strength Product Technologies: Plain Bearing Hinge: Plain bearing hinges feature knuckles that are machined to a smooth surface allowing them to move against one another without bearings. Plain bearing hinges are not recommended for heavy use on high traffic entrance ways but meet the need of a standard residential door. Material Type: Steel is cheap strong and durable making it a favorite for hinges of all types despite it being slightly more prone to rusting than solid brass or stainless steel. Mortise Hinges: Mortise door hinges mount flush with the surface of your door providing maximum strength with the least interference with door functionality. It is recommended that three hinges be used on doors up to and including 7-1/2 feet with one additional hinge for each additional 2-1/2 feet. Be sure to check your current hinges before making a purchase. Specifications: Height: 4 Width: 4 Material: Steel Mounting Type: Mortise Gauge: 0.0938 Number of Knuckles: 8 Number of Screw Holes: 5.