Compression Spring, Heavy Duty, Color Dark Gray, Music Wire, Finish Plain, Overall Length 1/2 In., Outside Dia. 3/16 In., Wire Type Round, Wire Dia. 0.032 In., End Type Squared and Ground, Large Outside Dia. 0.360 In., Small Outside Dia. 0.125 In., Compressed Length 0.319 In., Deflection @ Load 0.13 In., Spring Rate 65 lb./in., Meets/Exceeds ASTM-A228, AMS 5112, Package Quantity 10