... function polishing machine can be used for both tank and seal head dish from 500mm~4000 mm diameter As a ... prossional in polishing tanks,vessel,seal head ,range from 500mm~4000 mm diameter ,inner and outside both polished .DP Multifunction ... 28 μ m4.simple in structure, easy coperation, economical and parctical.DP Multifunction Polishing Machine Specification:ModelVessel External rangeInner ...