Compression Spring Heavy Duty Color Dark Gray Music Wire Finish Plain Overall Length 57/64 in Outside Dia 5/16 in Wire Type Round Wire Dia 0.035 in End Type Squared and Ground Large Outside Dia 0.360 in Small Outside Dia 0.125 in Compressed Length 0.335 in Deflection @ Load 0.40 in Spring Rate 18 lb./in Meets/Exceeds ASTM-A228 AMS 5112 Package Quantity 10