Richelieu 42821-B 3-1/2 Inch x 3-1/2 Inch Ball Bearing 1/4 Inch Radius Corner Mortise Door Hinge - Pair Black Door Hinge Bal

Richelieu 42821-B 3-1/2 Inch x 3-1/2 Inch Ball Bearing 1/4 Inch Radius Corner Mortise Door Hinge - Pair Features:Includes two hinges (2) in each orderFeatures precisely machined 1/4" radius corners Tested for residential and commercial strength applicationFeatures a removable pin, allowing you to easily remove your door without having to uninstall the hinges.Packaged with 6 wood screws and 6 machine screws for simple, out of the box installationConstructed with 6 screw holes in an arc arrangement for maximum mounting strengthProduct Technologies:Ball Bearing Hinge: Ball bearing hinges are designed to handle the extra stress brought on by high traffic doorways. The greased bearings reduce the rotational friction extending the life of a hinge in heavy use situations. These hinges tend to be more durable than standard, or plain bearing hinges.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: 3.5"Width: 3.5"Material: SteelMounting Type: Mortise : 0.125"Number of Knuckles: 6Number of Screw Holes: 5 Black