Self-aligning roller set is used in a way that corrects the belt tracking ... :30,000 hoursCertificates:CE, ISO, BV, SGS, IKA, ETC.Standards :GB, ISO, CEMA, DIN, JIS, ETC.Application:Coal industry, power industry ... /T.Packing details:Wooden cases, plywood cases. Self-Aligning Idler Set For Conveyor Belt