INTRODUCTION OF PRCDUCTS

 Precision Granite measuring tools ,instrument bases are made of high-quality "Jinan Black" After fine grinding,and hand lapping they are provided with high precision and long durability andsuitable for measuring applications in factories and laboratories.

The main mineral composition of "Jinan Black" granite is pyroxene, plagioclase, biotite and a trace of magnetite. It is black in color and has a precise structure. After hundreds of millions of years of aging, it has uniform texture, good stability, high strength and high hardness, and can maintain high precision under heavy load.