Guardian Drain Lock Square Floor Drain-Lock - Zurn Style 4.68" Guardian Drain Lock Floor Drain-Lock Square Zurn Style 4.68" Easily replace your existing grate without costly repairs No need to re-tap screws or replace the entire housing underneath. No Assembly required, easy to install. Features Nickel-Bronze Tops. Only a #45 Torx bit can unlock your drain grate (Torx bit sold separately)