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China Factory 1000kg Floor Spring for Heavy Duty Framed Door. 10-Year Warranty: Comprehensive 10-year quality guarantee for all mechanical defects. Heavy Duty Capacity: Supports doors up to 1000kg with EN7 high-efficiency closing force. Durable Construction: Tested for 2 million cycles without deformation, ensuring long life. Adjustable Mechanism: Axis adjustable all around, up & down with two-stage speed control. Wide Application: Suitable for framed doors, revolving doors, hotels, offices, and hospitals. OEM/ODM Service: Customization available for opening angles and other specific requirements. Professional Manufacturer: Over 33 years experience with daily production of 15,000+ units.