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1. Hidden installation, suitable for wooden doors, Pingkai Men, aluminum doors, fire doors, smoke doors, noise doors, security doors, and so on 2. Three-dimensional adjustable range: up and down ± 3.0mm, about ± 2.0mm, before and after the ± 1.0mm, do not have to remove the door can be adjusted 3. Opening degree: 180 degrees 4. Overall material: zinc alloy embryo + aluminum alloy core 5. The main surface treatment: sand nickel, sand chrome, pearl nickel, pearl chrome, green ancient, red ancient and so on 6. invisible hinges of 1, matching screws, adjustment tools,