... 190-3400mm 2.Used in mining,cement,steel,harbor Specification:cement return roller idler 1.Dia 89-219mm,length 190-3400mm ... 2.Used in mining,cement,steel,harbor,etc3.Certificate: ... , metallurgy, mine, coal, cement, steel, chemical, port, hydroelectric power, and grain industry. Summary of idler size Advantage:1.The life time ...