Features and Benefits: Made In USA; May eliminate the need for a screw extractor; Sizes: 1pc each: 1/8", 3/16", 1/4", 5/16", 3/8"; Left hand drill bits may loosen the broken stud; Drills Stainless Steel and Titanium Alloy; Sizes: 1/8, 3/16, 1/4, 5/16, 3/8;