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Haida Hot Sale Space Aluminum Adjustable Speed Hhydraulic Door Hinges. Adjustable Closing Speed: Closing speed and force can be freely adjusted to suit different needs. Universal Installation: No distinction between left, right, inside, or outside opening directions. High Durability: Passed 500,000 life tests ensuring long-term reliable performance. Silent Operation: Hydraulic oil system ensures smooth, noise-free opening and closing. Space Aluminum Material: Constructed from durable space aluminum for stable performance. Strong Load Bearing: Supports up to 30kg per piece with two pieces bearing 75kg capacity. Multiple Color Options: Available in Gold, Black, Silver, and Copper finishes.