Heat treatment, nitrifying, phosphiding, molybdenum sprayed, chrome plated, tin plated-whatever rings you need we can supply, we own speciality chemical lab and measure control machine. Products processed precisely with one line to produce starting from raw material casting to finished products. The quality of our rings is guaranteed by ISO9002 quality system certification which we have passed. Model: rings for BENZ,BMW,CUMMINS,TOYOTA,V.W,PEUGEOT.....