cup brush with shank cleaning of large metalsurfaces,wel scale and corrosion remobal , prior to welding,ships,steel tanks etc. cup brush with shank cleaning of large metalsurfaces,wel scale and corrosion remobal , priorto welding,ships,steel tanks etc. diameter :65mm,75mm,80mm shank dia : 1/4" raw material :steel,stainless package: colour box,blister card,double blister card