The 1803EVS Small Angle Grinder has a sensitive variable speed control of 2800 to 11,000 rpm, allowing users the ability to set speeds in the 3000-rpm range, which is ideal when used as a dry polisher with dry diamond polishing pads. Bosch also makes 18SG-5 and 18DC-5 dust extraction guards to significantly mitigate airborne dust in concrete surfacing/finishing and cutting, respectively. Bosch Tools. 877-267-2499.