... revolving resistance, long life, small maintain work and high load capability.Certificate 1. The best conveyor idler and roller in ... CE4.Management system: ISO9001:2008, ISO14001:2004,GB/T2800 Production Capacity:Material: Roller pipe using ERW pipe , and the roller ... 5 mm S Professional and newest designed hottest sale good load capacity steel gravity idler roller of conveyor spare parts in machinery ...