This product is mainly used in testing the straightness and flatness of work-piece and equipment installing.

Grade "0",grade "00" and grade"000" are valid.We have standard size in stock.and for special size we can make according to your requirements.

The Jingda granite series instruments are made of high quality Jinan black granite stone.Due to the high precision,long duration,good stability and corrosion resistance,they have been more and more used in product inspection of modern industry and scientific areas as mechianical space and scientific researches.

The precision of our products is in line with the standards of advanced countries.

Your inquiry is highly appreciated. We will offer you very competitive prices with high quality .Hope this will be a nice start of our long business cooperation.