Self Closing Door Hinge with 5/8" Radius Corners, 3.5" x 3.5", Matte Black Finish

DURABLE QUALITY: KNOBWELL 3.5 Inch Self Closing Door Hinges are made from high-qulity iron, with Black finish. Thanks to our own QC department, the black door hinges have passed 24 hours salt spray text and can be used for long-time, not easily to rust. EASY INSTALLATION: With all the necessary parts and instruction paper included in the package, we can install/replace the hinges by ourselves easily and quickly on wood, metal, interior, exterior, residential, or commercial doors. SELF-CLOSING FUNCTION: The adjustable door hinge is equipped with auto-closing function, which means the cabinet/door can be closed consistently without manual closing. With the help of included tools, we can adjust the tension of the internal spring to control the cabinet/door's self-closing speed. WIDE APPLICATIONS: A pair(2 pack) of hinges can support doors of 70-80 lbs. We recommend you install as least 2 hinges for each door and 3 hinges for doors from 80 lbs. This self-closing door hinges are spring-loa