Extension Spring Ultra Precision High Carbon Steel Plain End Type Full Twist Loops Overall Length 2 1/4 In Outside Dia 0.300 In Wire Dia 0.055 In Load 21.31 Lbs Deflection @ Load 0.70 In Initial Tension 1.92 Lbs Spring Rate 27.70 Lbs/In Meets/Exceeds ASTM A228 and AMS 5112 Package 3