Solid Brass Collection Deltana Square Corner Solid Brass Plain Bearing 3" x 3.5" Half-Mortise Hinge - Pair This beautiful Deltana product brings you the strength and durability you need in a tight space. The half mortise allows you the flexibility of application that you've been looking for and the variety of finishes provides you the perfect match to your home. 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 - Solid Brass: Solid brass is made from copper and zinc and is prized for its resilience, durability, and beauty. Solid brass can always be polished back to its original sheen and is highly resistant to rusting. Solid brass is often available in finishes that other hinge materials are not. 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. Deltana is the architectural hardware manufacturer with a proven record for exceptional service and quality. Deltana inventories the country�s largest selection of architectural, lighting, and door hardware in over nine fine finishes made from solid brass, zinc, aluminum, steel and stainless steel.