Extension Spring, Ultra Precision, High Carbon Steel, Plain, End Type Full Twist Loops, Overall Length 3/4 In, Outside Dia 0.300 In, Wire Dia 0.037 In, Load 7.20 Lbs, Deflection @ Load 0.26 In, Initial Tension 0.65 Lbs, Spring Rate 25.4 Lbs/In, Meets/Exceeds ASTM A228 and AMS 5112, Package 3