Baoji Zhipu Non-Ferrous Metals Processing Co.,Ltd is one of the most famous China niobium screw manufacturers and suppliers, welcome to wholesale cheap niobium nut, niobium bolt products from our company and factory. Product name Screw,nut,bolt,standard parts,nonstandard parts Material Tungsten,molybdenum,tantalum,niobium. Purity W≥99.95% Specification According to drawing or sample Standard GB Package Plywood case package