Features 【APPLICABLE OCCASIONS】. Suitable for flip cover for equipment, snack car, tricycle up door, advertising bar, light box, flip window, hood. 【HIGH QUALITY】Made of fine material of long service life,more durable in use. 【SIZE】The central distance of the spring is 290mm,suitable for a large range of application. We provide different spring of different pressure to meet your different needs. 【PRACTICAL FUNCTION】The stroke is 100mm which is enough for most scenarios. 【SERVICE 】: If you encounter any problems during use, please let us know. We will contact you quickly. It is our pleasure to help you. Specification: Item Type:Gas Spring  Central Distance: 290mm / 11.42in Stroke: 100mm / 3.94in Pressure: 100N 300N 500N(Optional) Package List: 1 x Spring Note:2 caps with a pressure of 100N can support a lid of about 6-10 kg; 2 caps with a pressure of 300N can support a lid of about 24-30 kg; 2 pieces of pressure 500N can support a lid of about 40-47 kg. Package List