Spring Hinges Collection Deltana Square Corner 3.5 x 3.5 Steel Spring Hinge Mortise Hinge Nothing less than excellence can be expected from a Deltana spring hinge. Featuring an adjustable spring mechanism, these hinges offer discrete beauty to your home or business that can't be found with anyone else. Features: Sold Individually Spring Hinge Residential Strength Removable Pin: No Wood Screws Included Square Corners Traditional / Classic Theme Arc Hole Pattern Spring 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: 3.5 Inch Height 3.5 Inch Width Made from Steel Mount: Mortise Gauge: 0.097 (Thickness of Hinge Steel) 3 Knuckles 6 Screw holes Deltana is the architectural hardware manufacturer with a proven record for exceptional service and quality. Deltana inventories the countryâs largest selection of architectural, lighting, and door hardware in over nine fine finishes made from solid brass, zinc, aluminum, steel and stainless steel.