Extension Spring Utility Standard Steel Oil End Type Full Twist Loops Overall Length 4 in Outside Dia 0.250 in Wire Dia 0.030 in Fabric Sleeve Outside Dia 0.33 in Load (Lbs.) 1.15 Deflection @ Load 1.00 in Spring Rate (Lbs./in) 0.65 Meets/Exceeds ASTM A227/A228 and AMS 5112