Steel Collection Deltana 5/8 Radius Corner 3.5 x 3.5 Steel Ball Bearing Mortise Hinge - PairThis solid steel hinges brings with it the promise of a better home. Ball bearings mean more durable, less squeaks and smoother action that you can depend on for the years to come in your contemporary or traditional home.Features:Sold as PairBall Bearing HingeHeavy Duty StrengthRemovable Pin: YesWood Screws Included5/8 Radius CornersTraditional / Classic ThemeArc Hole PatternBall 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 - Steel: Steel is cheap strong and durable making it a favorite for hinges of all types. Though it is more prone to rusting than solid brass or stainless steel.Mounting: The standard corners for mortised door hinges are 1/4 radius, 5/8 radius and square corner. It is recommended that three hinges be used on doors up to and including 7.5 feet with one additional hinge for each additional 2.5 feet. Make sure you check your current hinges before making a purchase.Specifications:3.5 Inch Height3.5 Inch WidthMade from SteelMount: MortiseGauge: 0.085 (Thickness of Hinge Steel)5 Knuckles6 Screw holesDeltana is the architectural hardware manufacturer with a proven record for exceptional service and quality. Deltana inventories the countryÃ's largest selection of architectural, lighting, and door hardware in over nine fine finishes made from solid brass, zinc, aluminum, steel and stainless steel.