Features and Benefits: Made In USA;May eliminate the need for a screw extractor;135? Split Point Starts On Contact Will Not Walk;Short Stubby Left Hand Drill Bits;Left Hand Drill Bits Must Be Used With The Drill Motor In Reverse Mode;Body Clearance Are Gold Surface Treated For Maximum Lubricity;KnKut left hand stubby short length drill bits may eliminate the need for a screw extractor by loosening the stud, releiving the pressure and backing out the broken bolt.