... roller set is used in a way that corrects the belt tracking and maintains it constantly in the central position. Name ... .Standards :GB, ISO, CEMA, DIN, JIS, ETC.Application:Coal industry, power industry, cement industry, harbor, metallurgy.Advantages:(1)Easy installation and nice flexibility ... .Packing details:Wooden cases, plywood cases. Self-Aligning Idler Set For Conveyor Belt