KINGSTONE CO., LTD. Is the professional manufacturer for diamond products . Mainly products : diamond cutting blades, diamond cutting segments, diamond core drills , diamond polishing tools, diamond wire saw etc., and all kinds of other diamond tools . Our company has perfect technology and test instruments, devotes to the research and development of all kinds of super hard material products . The quality of our products are steady , has gained very good comment from all our clients who use KINGSTONE diamond tools .