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+.