Compression Spring Heavy Duty Color Dark Gray Music Wire Finish Plain Overall Length 5/8 in Outside Dia 31/64 in Wire Type Round Wire Dia 0.055 in End Type Squared and Ground Large Outside Dia 0.360 in Small Outside Dia 0.125 in Compressed Length 0.285 in Deflection @ Load 0.29 in Spring Rate 56 lb./in Meets/Exceeds ASTM A228 and AMS 5112 Package Quantity 10