DEWALT DWH303DH-Onboard Rotary Hammer Dust Extractor For 1-Inch SDS Plus HammersThis OSHA Table 1 compliant Dust Extractor works with the DCH273 1 inch 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