... can make piece work easier be rolled. It can rotate in positive and negative direction, good for the sand-blasting work ... to the large treatment of small work pieces or castings (aluminum-zinc die-casting, forging part).eliminating rust, oxide skin, grains, water wave ... resin sand, light steel ball, steel sand, stainless steel ball, aluminum ball, etc. technical ParameterCJ-GT-5 Gun Crawler Type Sand ...