These Onboard Dust Extractor Standard Bit Head Replacements easily snap on and off for tool-free change and replacement in seconds. When a Bit Head wears out, just remove it, attach a new one, and keep working. Use them with our DEWALT® DWH303DH or D25303DH Onboard Dust Extractors as part of an OSHA Table-1 compliant solution when drilling to install virtually any concrete anchor system, including MINI-UNDERCUT+™ and Smart DI+™.