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