... W-1(W>99.98%), Dia. :17.5mm Length :720-750mm Mainly used to found ingredient of material, cutter and heads, Tungsten Rod W-1(W ... ≥99.98%),Purity: W≥99.98%Dia. :17.5mmLength :720 ... used to guns, artillery,rockets, satellite,airplane and shipChemical Composition (%)Main Comp.W≥99.98Other Content≤Fe0.0026Al0.0006Si0.001Ca0.001Ni0 ...