Silent Bearing Design: High-quality bearings, smooth rotation and good silent effect. Thick leaves for durability. Fully Open Hinge Connectors Dimension: 4 inches. Equipped with full steel balls in the hinge to reduce friction and resistance. The stainless steel toothed hinge material improves the product and provides more durable performance. Mounting Holes with Screws: 8 mounting holes on each hinge, which perfectly match the 8 screws of the replacement hinges - easy to use. Material: Made of high-quality steel with a long service 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: hinges are used to hang cabinet doors, garden doors, side doors, wooden boxes, etc. Instructions for 4-inch mother-in-one hinge Product name: son and mother hinge Child-mother hinge specifications Mother and son hinge color: black Mother and son hinge material: high quality stainless steel Mother and son hinge