Common a century ago, these are uniquely sprung door hinges.
The spring geometry is configured such that when the door is opened past about 110°, the spring acts in the opposite direction to hold the door open.
Hinge footprint is just shy of 3" × 3".
Cast steel with linished and polished highlights, they are based on an antique example in our collection. Priced per pair.
Wonderfully appealing hinges.
Requires six #8 mounting screws per hinge (not included).