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Automatic Spring Door Closer, 2 Spring Hydraulic Buffer Adjustable Door Stopper Speed Mute Closing Fit For 25 To 80KG Door Hardware (Black M) (Color : Silver L) Suggestion: The speed of closing from 180 to 15 degree should be little fast, and the speed of latching from 15 to 0 degree should be little slow, so that the door can be closed and avoid to be damaged. Applicable scenes: Market's access door,... Automatic Spring Door Closer, 2 Spring Hydraulic Buffer Adjustable Door Stopper Speed Mute Closing Fit For 25 To 80KG Door Hardware (Black M) (Color : Silver L)