Compression Spring Precision High Carbon Steel Music Wire Finish Plain Overall Length 3/4 In Outside Dia 0.720 In Wire Type Round Wire Dia 0.063 In End Type Closed and Ground Compressed Length 0.284 In Load 15.51 Lbs Deflection @ Load 0.47 In Spring Rate 33 Lbs/In Meets/Exceeds ASTM A228 Package 5