Extension Spring Utility Brass Plain End Type Full Twist Loops Overall Length 1-3/64 in Outside Dia 0.300 in Wire Dia 0.040 in Fabric Sleeve Outside Dia 0.38 in Load (Lbs.) 2.61 Deflection @ Load 0.15 in Spring Rate (Lbs./in) 7.8 Meets/Exceeds ASTM B134