1.Idler diameter:50-219mm . 2.Length:190mm to 3500mm . 3 ... by our company adopt high quality steel tubes dedicated for idler, stamping bearing pedestals, special bearings, and multiple labyrinth seals. ... equipment and fine technology guarantee that key performance indexes of idler, such as rotational damping coefficient, radial run-out and ... life, low noise , and low cost, are fully embodied. idler set