These left handed drill bits are made of quality high speed M2 steel, with long-lasting titanium nitride coating. Drill bits are with 135-degree split point design, penetrates 75% faster. Left handed drill bits turn counterclockwise, which is useful for extracting broken screws. Features: 135-degree split point and twist design, good for self-centering and prevent "walking". Bits are made of high speed M2 steel with a titanium nitride coating for good durability. Special left handed design can also be used with screw extractors to remove broken fasteners. Attachable to reversible drills to remove screws, bolts and studs around the house, garage or on the job site. Sizes included: 1/4", 15/64", 7/32", 13/64", 3/16", 11/64", 5/32", 9/64", 1/8", 7/64", 3/32", 5/64", 1/16". Comes in a metal index box for easy carrying and storage. Specifications: Material: High Speed M2 Steel Quantity: 13pcs Sizes: 1/4", 15/64", 7/32", 13/64", 3/16", 11/64", 5/32", 9/64", 1/8", 7/64", 3/32", 5/64", 1/16" Box Size: 13 * 8.5 * 1.8cm / 5.1 * 3.3 * 0.7in Package Weight: 264g / 9.33oz Package List: 13 * Drill Bits 1 * Storage Box