Spring Hinges Collection Deltana Square Corner 4 x 4 Steel Spring Hinge Mortise Hinge - Single HingeBeautiful steel construction offers a contemporary styling for this spring hinge from Deltana. The adjustable spring mechanism gives you the functionality to have the door that you want when you want it.Features:Sold as Single HingeSpring HingeResidential StrengthRemovable Pin: NoWood Screws IncludedSquare CornersTraditional / Classic ThemeZig Zag Hole PatternSpring Hinge: These single action hinges are fitted with springs in the barrel to bring an open door back to a closed position automatically. Great where door space is at a premium and door closers are impractical. With double action hinges, the door is able to move in either direction.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:4 Inch Height4 Inch WidthMade from SteelMount: MortiseGauge: 0.097 (Thickness of Hinge Steel)3 Knuckles8 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.