Metal/Vitrified bond diamond and CBN Honing stones. We have years of experience at manufacuturing metal/vitrified bond diamond & CBN honing stones in compressor-cylinder piston and crankshaft hole honing Our superabrasives honing stones are designed to used on Sunnen,Nagel,Gehring,Nissin honing machines.We can supply a complete range of SUNNEN types honing stones in large quantity at competitive price.