... . 4.Surface:Polished. 5.Grade:W1,W2 Tungsten Rod(Shaft)pure tungsten rodfor all fields use.Surface:Polished.Purity:99. ... found ingredient of material, cutter and heads, conductor of heat,as the material and additive, crankshaft and cylinder barrel of advanced automobile, ... ingredient of kinds of heat-resistent steel and electrode, mainly used to guns, artillery,rockets, satellite, ...