The DEWALT Impact Rated Holesaws have a double tooth design that strengthens each tooth for longer life and improved durability. The sharper tooth geometry cuts material faster for faster drilling and the thick, hardened backing plates preventing thread stripping. The ejection spring allows for ease of use with no plug removal and the thin walled design is optimized for metal drill efficiency. Suitable for metal, aluminium, PVC and Inox. The DEWALT DEWDT8253QZ impact rated holesaw is 19mm