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FEATURES
? UL listed floor spring, ANSI/BHMA 156.4 Grade 1 Certification
? Two-speed adjustment, closing smoothly.
? Slim square box design, easy installation
? 2,000,000cycles tested by Intertek
? Applicable for glass door, wooden door, aluminum door and frame door
? Different Cam for Optional (Germany, Italy, Brazil, Japan and so on)link:https://www.heinda-cn.com/floor-spring/single-cylinder-floor-spring/high-quality-single-cylinder-floor-spring.html