When used with a dust extractor, DEWALT's Hollow Drill bit extracts dust while drilling for less dust, fast holes and fast adhesive anchor installation. DEWALT's Hollow Bit is part of their Perform & Protect product line, minimizing users' exposure to dust while drilling. The bit is also OSHA Table 1 compliant. Connects directly to DEWALT's Airlock System forming a secure, locking connection between bit and dust extractor.