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 0.018 in End Type Squared and Ground Large Outside Dia 0.360 in Small Outside Dia 0.125 in Compressed Length 0.144 in Deflection @ Load 0.26 in Spring Rate 7 lb./in Meets/Exceeds ASTM-A228 AMS 5112 Package Quantity 10