Flex LD1509FR 5-Inch Dustless Concrete Grinder,Flex,LD1509FR" /> FLEX four-fold FR electronic control Quality shut-off carbon brushes protect the moor against damage Vacuum dust collection protects against abrasive dust and reduces disc wear while keeping concrete pores open 5/8 - 11 spindle thread No load speed 10,000 RPM 11 Amp