Extension Spring, Ultra Precision, 302 Stainless Steel, Plain, End Type Machine Hooks, Overall Length 4-1/2 In., Outside Dia. 0.375 In., Wire Dia. 0.055 In., Load (Lbs. ) 14.73, Deflection @ Load 2.53 In., Initial Tension (Lbs. ) 1.74, Spring Rate (Lbs. /In. ) 5.13, Meets/Exceeds ASTM A313 and AMS 5688, Package Quantity 3