Established in 1997, Yantai Powerful Honing Application Co.,Ltd. is a professional manufacturer of powerful honing stone.With devoting to the comprehensive research for honing technology for many years,our products are widely used in honing for inner bore of circle tubular products,such as engineering hydraulic cylinder, cylinder pump in oil fields,coal mine hydraulic prop,the engine liner, military gun boring,etc.Having strong technical force,advanced production technology and strong professional formula,the quality of our products has the leading position in China.Our products are being...