... . It can rotate in positive and negative direction, good for the sand-blasting work.4. It adopts upper whirlwind separation ... to the large treatment of small work pieces or castings (aluminum-zinc die-casting, forging part).eliminating rust, oxide skin, ... light steel ball, steel sand, stainless steel ball, aluminum ball, etc. technical ParameterCJ-GT-5 Gun Crawler Type Sand Blasting MachineThe size ...