This model of the Global Door Controls 4.5 in. x 4.5 in. steel spring hinge comes in a brushed chrome finish and functions as a full mortise, single acting spring hinge. Recommended for use where automatic self closing of a door is required. This three knuckled hinge is adjustable and the spring tension can be increased or decreased by using included adjusting tool. UL R19063 listed for \”A\” label fire doors Steel base material Template screw hole locations Fasteners: packed with both wood and machine screws Conforms to ANSI/BHMA-K81071F for self-closing hinges Meets NFPA 80 for 3 hour fire rating Corners: square Features Item Weight 3.24 Commercial/Residential Commercial,Residential Builders Hardware Product Type Door Hinge Package Quantity 3 Commercial Hardware Type Hinges Material Steel Hinge Radius Square Pin type Fixed Pin Hinge Feature Mounting Hardware Included Returnable 180-Day Hardware Finish Family Chrome Finish Brushed Chrome Mounting Type Wall Fasteners included Yes Hinge Type Spring Product Depth (in.) 0.75 Product Height (in.) 4.5 Product Width (in.) 4.5 Manufacturer Warranty 90 days for visible defects; 1 year for manufacturing defects; 25 year Limited Abrasive Wear warranty; 25 year Limited Texture Retention warranty