Specification of Healds with spring assemblyLength of Spring : 500, 600, 700, 800 mmTension of Spring : 300, 400, 500, 600, 700 gramTube Length : 240 mm, 290 mm or required Eye No Sketch Dimension328R 4.2 X 2.3380R 5.6 X 2.71080R 6.6 X 3.9390R 8.0 X 4.2420R 9.0 X 4.8450R 10.0 X 6.3.