Extension Spring, Ultra Precision, 302 Stainless Steel, Plain, End Type Full Twist Loops, Overall Length 2 1/2 In, Outside Dia 0.500 In, Wire Dia 0.055 In, Load 11.38 Lbs, Deflection @ Load 2.32 In, Initial Tension 1.04 Lbs, Spring Rate 4.43 Lbs/In, Meets/Exceeds ASTM A313 and AMS 5688, Package 3