Silent bearing design: high quality bearings, fluid rotation and good silent effect. Thick leaves for more durability. Dimension of fully open hinge connectors: 4 inches. Entirely steel marbles in the hinge to reduce friction and resistance. Stainless steel hinge material improves the product and offers more durable performance. Mounting holes with Screw: 8 fixing holes on each hinge, which perfectly match the 8 screws of the replacement hinges - easy to use. Material: Made of high quality steel with long life. The stable structure is firmly connected to the door and the door. The design and shape of the cargo are very light. Wide range of uses: The hinges using to hang cabinet doors, garden doors, side doors, wooden crates, etc. Instructions for the 4-inch mother hinge Product name: Hinge son and mother Childrens hinge specifications Mother hinge color and wire: black Material of the mother hinge and son: high quality stainless steel Specifications of the mother hinge and son: 4 inch Size: Specific dimensions shown in Fig Products included in the package 2 Child and mother hinges screw Reminder Manual measurement, please allow an error of 1 to 2 mm