Key Specifications & DesignBrand: Yale (stamped directly onto the metal leaves)Size: 4 inches (102mm), a standard specification optimized for heavy interior or exterior residential and commercial doors.Mechanism: Integrated ball bearings that eliminate metal-on-metal squeaks and ensure an ultra-smooth, long-lasting swing.Hole Pattern: Standard template layout with 4 screw holes per leaf (8 total per hinge) to secure a balanced distribution of heavy door weights.