Extension Spring Utility Standard Steel Oil End Type Full Twist Loops Overall Length 10 in Outside Dia 0.630 in Wire Dia 0.070 in Fabric Sleeve Outside Dia 0.74 in Load (Lbs.) 8.80 Deflection @ Load 3.00 in Spring Rate (Lbs./in) 2.9 Meets/Exceeds ASTM A227/A228 and AMS 5112