Compression Spring Heavy Duty Color Dark Gray Music Wire Finish Plain Overall Length 5/8 in Outside Dia 0.3 in Wire Type Round Wire Dia 0.051 in End Type Squared and Ground Compressed Length 0.415 in Deflection @ Load 0.17 in Spring Rate 122 lb/in Meets/Exceeds ASTM A228 and AMS 5112 Package Quantity 10