Extension Spring Ultra Precision High Carbon Steel Plain End Type Full Twist Loops Overall Length 5 In Outside Dia 0.500 In Wire Dia 0.055 In Load 13.10 Lbs Deflection @ Load 6.10 In Initial Tension 1.20 Lbs Spring Rate 2.00 Lbs/In Meets/Exceeds ASTM A228 and AMS 5112 Package 3