Die Spring, Extra Heavy Duty, Color Red, Oil Tempered Chrome Silicone, Finish Plain, Overall Length 3-15/16 In., Outside Dia. 2-3/8 In., Wire Dia. N/A, End Type Closed and Ground, Large Outside Dia. 0.360 In., Small Outside Dia. 0.125 In., Compressed Length N/A, Deflection @ Load 0.05, Spring Rate 2 lb./in., Meets/Exceeds ASTM A313, AMS 5688