A PAIR(2) BETTER BUILT Truck Pick Up Tool Box Chest Gas Strut Shock Spring Lift Prop 13" extended length x 8 " compressed length x 30 LB Pressure Extended Length: 13" (center to center of ball socket ends) Compressed Length: 8" Force: 30 pounds of pressure (Per Prop) End Fitting: 10mm Ball Socket and 10mm Ball Socket Set of Two