Accuracy of large metal loops (1.0 mm, 0.040 bore) is about 5%, intermediate loops (0.5 mm, 0.020 bore) 10%, and small loops (0.2 mm, 0.007 bore) 30%. Bore: 0.51 mm. Model 7725 Injector loops are not interchangeable with loops for the Model 7125. The port angle for the 7725 is 30° whereas the port angle for the 7125 is 20°, requiring the loops to have a different shape.