Extension Spring Utility Standard Steel Oil End Type Machine Half Loop Overall Length 11-11/16 in Outside Dia 1.250 in Wire Dia 0.160 in Fabric Sleeve Outside Dia 1.43 in Load (Lbs.) 66.00 Deflection @ Load 3.00 in Spring Rate (Lbs./in) 13 Meets/Exceeds ASTM A227/A228 and AMS 5112