​product name：zirconia flap disc basic information： type：T27/T29 grain：zirconia backing：heavy X-wt cotton cloth cover：7/7+1/9/9+1 fiberglass cover outer dia.：4"/4.5"/5"/7" core：5/8" or 7/8" grit:40/60/80/120 feature： 1.sharp&fast grinding 2.lager&thickening falp，high work efficiency 3.uniform sanding&polishing effect 4.especially used for ss.st grinding 5.good synchronization，long lasting&durable application： rust, paint,welding, ferrous, stainless steel, and non-ferrous metals, wood and plastics