Extension Spring Utility Standard Steel Oil End Type Full Twist Loops Overall Length 6-7/16 in Outside Dia 0.440 in Wire Dia 0.050 in Fabric Sleeve Outside Dia 0.53 in Load (Lbs.) 4.20 Deflection @ Load 1.90 in Spring Rate (Lbs./in) 1.1 Meets/Exceeds ASTM A227/A228 and AMS 5112