1.tungsten steel material 2.double inlet sandblast gun 3.diameter:6,8,10,12mm 4.surface ... steel surface treatment,descaling,removing residue Ø81703.92400116015-30Ø91704.965.6147015-30Ø101806.1622180020-35Ø121908.8900305020-40NOTE:1.Our price ... will give you best service and care. High speed(double inlet) air blast gun