Extension Spring Utility Standard Steel Oil End Type Full Twist Loops Overall Length 3-31/32 in Outside Dia 0.730 in Wire Dia 0.060 in Fabric Sleeve Outside Dia 0.86 in Load (Lbs.) 2.75 Deflection @ Load 0.72 in Spring Rate (Lbs./in) 1.66 Meets/Exceeds ASTM A227/A228 and AMS 5112