Description: 【Large Load Capacity】: Heavy duty invisible stone door hinge, is designed to support maximum door weight up to 100kg, has a strong load bearing capacity, making it ideal for heavy duty applications 【Versatile Compatibility】: The concealed door hinge is suitable for both left and right handed doors, suitable for stone doors with a thickness of 20mm-25mm/0.79inch-0.98inch 【Premium Construction】: Crafted from premium stainless steel material, this fire hydrant door hinge is sturdy, not easy to break and deform, and ensures a long time to use 【Adjustable Opening Angle】: The flexible invisible door hinge features an adjustable opening angle range from 160°-180°, is easy to operate and has a long service life 【Wide Applications】: The versatile door hinge is suitable for heavy doors such as stone doors, secret doors, fire hydrants, fence gates, pipe well doors, etc Specification: 10.8cmx10.5cmx7.8cm/4.25inchx4.13inchx3.07inch Size Chart: Material: Stainless Steel Maximum Door Weight: 100kg Opening Angle Adjustment Range: 160°-180° Up and Down Adjustment: ±2mm Forward and Backward Adjustment: ±2mm Minimum Square Steel Size: 4cmx4cm/1.57inchx1.57inch Package Includes: 1 Set Invisible Stone Door Hinge Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.