15-Piece Left Handed Titanium Screw Extractor with metal index storage box included for quick size identification. [QUALITY]: This drill bit set is constructed of high speed steel with a titanium nitride coating, which give it very high surface hardness to help penetrate tough materials while highly corrosion resistant reducing friction between bit and workpiece. [DESIGN]: These drill bits come with a twist design to increase cutting speed with an angled tip that is a 135 degree split point for precise self-centering and designed to cut holes faster as it prevents walking, clears chips and particles faster. [LEFT-HAND BITS]: Special left hand design can also be used with reversible drills with screw extractors to remove broken fasteners and to remove screws, bolts, and studs for home repairs, at your automotive garage, and more. [CONVENIENCE]: Each bit has an assigned hole in a drill bit holder with size index markings for quick organization and easy storage for use for home improvement or on the go in a snap. [INCLUDES]: 15 Sizes - 1/16, 3/32, 1/8, 5/32, 3/16, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 13/32, 7/16, 15/32 and 1/2 inch bits that comes in a metal index case for easy storage. B000BMJX8C