Use for aluminum. 1:safety . 2:Larger let cut rate. 3:use for aluminum very high effieiency. It is specific for polishing and cutting copper , aluminium etc non-ferrous metal materials , also is usd to frp material , perspex , flume ,stone , rubber , fiber ,wood etc nonmetal materials. It is perfectly for polishing welding line and removing rust in dock .The product characters as flexible,bores ...