A PAIR(2) BETTER BUILT Truck Pick Up Tool Box Chest Gas Strut Shock Spring Lift Prop 14" extended length x 8.5 " compressed length x 40 LB Pressure Extended Length: 14" (center to center of ball socket ends) Compressed Length: 8.5" Force: 40 pounds of pressure (Per Prop) End Fitting: 10mm Ball Socket and 10mm Ball Socket Set of Two