This OSHA Table 1-compliant Dust Extractor works with the DCH273 1 in. Hammer. It features an OSHA 1926.1153-compliant Dust Box Assembly. With a filter cleaning mechanism and a HEPA filter, it removes 99.97% of airborne particles 0.3 microns or greater. \n \n The Dust Extractor has a powerful built in motor for increased suction during high performance drilling. The 2-second power-off delay ensures that dust extraction continues after the drill is switched off. It accomodates drill bit diameters up to 5/8 in. which allows users to drill overhead for 1/2 in. drop-ins.