Extension Spring, Safety Drawbar, High Carbon Steel, Zinc Plated, End Type Closed Drawbar, Overall Length 6 In, Outside Dia 1.162 In, Wire Dia 0.072 In, Load 11.10 Lbs, Deflection @ Load 4.00 In, Spring Rate 2.77 Lbs/In, Meets/Exceeds ASTM A227