Made with bio-degradable, no hazard to water, grade oil (WGK), making them the marine industry's most environmentally friendly gas springs. All springs pass ASTM B117, Attwood Salt Spray and a 30,000 cycle lifecycle test. Features Eyelet upper mount Eyelet lower mount Specifications Color: Black Compressed Length: 10.5" Extended Length: 17.2" Travel Length: 7" Output Force: 20 lbs Socket: 10 mm Size: 8 mm Rod X 18 mm Cylinder Country of Origin: USA