Extension Spring, Safety Drawbar, 302 Stainless Steel, Plain, End Type Closed Drawbar, Overall Length 4 In, Outside Dia 0.675 In, Wire Dia 0.048 In, Load 5.24 Lbs, Deflection @ Load 2.30 In, Spring Rate 2.28 Lbs/In, Meets/Exceeds ASTM A313 and AMS 5688