Extension Spring Ultra Precision High Carbon Steel Plain End Type Full Twist Loops Overall Length 2 3/4 In Outside Dia 0.360 In Wire Dia 0.045 In Load 10.20 Lbs Deflection @ Load 2.27 In Initial Tension 0.90 Lbs Spring Rate 4.10 Lbs/In Meets/Exceeds ASTM A228 and AMS 5112 Package 3