Extension Spring Utility Standard Steel Oil End Type Machine Half Loop Overall Length 3-51/64 in Outside Dia 0.720 in Wire Dia 0.110 in Fabric Sleeve Outside Dia 0.84 in Load (Lbs.) 44.30 Deflection @ Load 1.21 in Spring Rate (Lbs./in) 28.09 Meets/Exceeds ASTM A227/A228 and AMS 5112