Can be used for interior and exterior applications, Corrosion-resistant coating. Designed to resist 1500+ hours of salt-spray testing before developing 5% red rust (per ASTM B117)., The RECEX® Robertson/Phillips combo drive produces a cling fit that reduces driving effort, promotes faster driving and extends bit life., Features a large wafer-type head that provides exceptional holding power., Strip-out prevention ribs prevent "pull through."