... 270MM*550MM 3)Siemens motor 4)Efficient JS-550 double head stone floor grinder Market position: We are manufacturer for ... covering resin bond diamond pad, metal bond diamond pad, PCD blade, Frankfurt, sandpaper, etc. Product Features: 1. No. ... seperate. 14. Higher precision,higher hardness and longer life. 15. Intelligent speed adjustment and trouble shooting. Specification: ModelVoltageFrequencyPower ...