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. 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 u