Extension Spring, Ultra Precision, High Carbon Steel, Plain, End Type Full Twist Loops, Overall Length 1 In, Outside Dia 0.240 In, Wire Dia 0.029 In, Load 4.50 Lbs, Deflection @ Load 0.74 In, Initial Tension 0.40 Lbs, Spring Rate 5.5 Lbs/In, Meets/Exceeds ASTM A228 and AMS 5112, Package 3