Rubber coated Conveyor Roller ZY Conveyor rollers manufactured to your specifications! We ... , 50, 60mm Shaft: Cold round steel GB/T905-1994 Cold hex steel GB/T905-1994 Spring loaded type diameter 11hex, 12mm ... treatment: noneExtensive use transporting roller, roller, gravity roller, conveyor roller, rubber coated roller. Yellow Rubber coated gravity roller