Extension Spring, Safety Drawbar, High Carbon Steel, Zinc Plated, End Type Closed Drawbar, Overall Length 13 3/4 In, Outside Dia 2.462 In, Wire Dia 0.312 In, Load 313.81 Lbs, Deflection @ Load 3.40 In, Spring Rate 92.3 Lbs/In, Meets/Exceeds ASTM A227