This OSHA Table 1 Dust Extractor works with the 25.4 mm (1 ") drill DCH273. It has a dustbox assembly that complies with OSHA 1926.1153. With a filter cleaning mechanism and a HEPA filter, it removes 99.97% of airborne particles of 0.3 micron or more. The dust extractor has a powerful built-in motor for increased suction during high performance drilling. Dusting can be continued with a delay of 2 seconds after stopping the drill. It accepts drill diameters of up to 15.8 mm (5/8 in.), Allowing users to drill for 12.7 mm (1/2 in.) Openings.