Conveyor Idlers. ASGCO has a vast selection of idlers, designed and built for the toughest jobs, that set the standard of ex cellence for bulk material handling. Our full line of nveyor idler (rollers) products, meet or ex ceed CEMA C, D, E specifications. We represent the highest quality idlers to assist our customers in helping make their plant/mine/facility to bOkayme more efficient, safe and productive.