Set of RV Marine Gas Spring/Prop/Strut/Shock 21.65" extended length x 12.91 " compressed length x 63 LB Pressure Extended Length: 21.65" (center to center of ball socket ends) Compressed Length: 12.91" Force: 63 pounds of pressure (Per Prop) End Fitting: 10mm 16 Degree Ball Socket and 10mm Ball Socket Set of Two