QSM-150 Bridge Type single head stone grinding machine is one of the series of stone processing machinery products designed and manufactured by our factory, it is a automatic polishing machine with one head. Having been combined the machinery, electric and air operating principals, it is used to grind and polish natural granite, marble slabs or various kinds of hard artificial stones. The after-polished surface is with very high flatness and glossiness, as well as the processing costs is very low, because using the common abrasives to polish the ordinary granite can easily reach over 80degrees of glossiness. And it makes a feature of stable performance, easy operation, and high efficiency.