1,The central distance of the spring is 280mm,applicable to many scenarios. 2,Made of fine material of long service life,more reliable in use. 3,We provide different spring of different pressure to meet your different needs. 4,The stroke is 100mm which is enough for most scenarios. 5,Suitable for flip cover for equipment, snack car, tricycle up door, advertising bar, light box, flip window, hood. Features: The central distance of the spring is 280mm,applicable to many scenarios. Made of fine material of long service life,more reliable in use. The stroke is 100mm which is enough for most scenarios. We provide different spring of different pressure to meet your different needs. Suitable for flip cover for equipment, snack car, tricycle up door, advertising bar, light box, flip window, hood. Specification: Item Type:Gas Spring Central Distance: 280mm or 11.02in Stroke: 100mm or 3.94in Pressure: 100N 300N 500N (Optional) Package List: 1 x Gas Spring Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.