Powerful BL Brushless motor delivers 0-950 RPM, 0-4, 700 BPM and 1. 7 ft. lbs. of impact energy to handle the most demanding applications The on-board dust extractor attachment captures concrete dust during drilling and is activated by the tool for operator convenience OSHA Table 1 compliant concrete drilling solution when used in conjunction with Filter Cleaning Mechanism Dust Case (part #199588-6) Extractor is powered by a separate motor to maintain drilling performance and provide a 2-second delay to help capture remaining dust Efficient HEPA filtration system captures 99. 97% of particulates . 3 microns and larger