... Flap DiscApplications by different abrasive:1)Aluminium Oxide,symbol: ASuitable for iron, mid steel,welding rods,cost iron aluminium,non-ferrous ... .2)Silicon Carbide (disc in black color),symbol:CSuitable for marble,stone,building materials,hand materials,glass.3)Zirconium,symbol:Z4 ... )T27/T29 is available.Suitable for heavy deburring and finishing on metals.High per formance. ...