Features SUPPER STRONG: 100N/300N/500N for your different needs. Super Strong and stiff, you couldn't compress them by your hand!! Suitable for lids or doors weighing between 80 pounds and 130 pounds! APPLICATION: The Spring Hydraulic Rod central distance of the spring is 290mmMost used for Heavy-Duty equipment such as bed compartment, outdoor TV Cabinet, RV Bed，marine projects, Boat Bed, camper shell, Boat Bed，truck canopy, trap door, trailer door, trash bin, and other Heavy project. TIPS:If you feel it is too powerful to close and you have a lot of flexibility in where they can mount, you can move the mount point on the lid towards the hinges' direction. APPLICATION: Suitable for flip cover for equipment, snack car, tricycle up door, advertising bar, light box, flip window, hood. NOTE: Do measure the lid's weight before your purchase ,in case of a wrong item you will buy Features: 1. Suitable for equipment flip lid, snack car flip door, advertising bar, light box, flip window and hood lid. 2. Made of high quality material for rigidity and durability, specially treatment for corrosion-proof. 3. The center distance is 280mm and it can provide stable performance. 4. High reliability, a good replacement for the broken one. 5. Strong and not easy to break, long service life.   Specification: Item Type: Gas Spring Center Distance: Approx. 280mm / 11in Stroke: Approx. 100mm / 3.9in Bore: 18mm / 0.7in Rod diameter: 8mm / 0.3in Pressure: 100N, 300N, 500N (optional) Joint: Flat Joint   Package List: 1 x Gas Spring   Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. Package List