. Product Specification of Our Brake Disc: 1) Long service life & stable performancemancemance 2) 100% crucial dimension inspection 3) 100% qualification 4) Low noise standard for casting is HT250. Standard for machining is SAE-j431. 5) Factory supplier & various automobile brake discsdiscsdiscs About Us: Shandong Zhengnuo Group Co., Ltd is was found in September 2011, totally invested 290 million with 133333 square meters, where located in dongying manufacturing industry part, shandong, china. The company is the professional high and new technology enterprice with collection research and development, production, and sale of automobile brake rotors brake drums and brake calipers The equipments of our manufacture: 1. Japan KOYO caasting line 2. South korea kia 3. South korea DOOSAN NC processing center line 4. Domestic advanced full- automatic clean -packing production line