High-Speed Steel Construction: Precision-engineered from M2 high-speed steel with a titanium nitride coating for superior hardness and heat resistance, ensuring long tool life and efficient drilling through tough materials like stainless steel and cast iron.;Left-Hand Thread Design Advantages: The specially designed left-hand thread allows for effective use with reversible drills and screw extractors, making it ideal for removing broken or stripped screws in automotive, industrial, and home repair applications.;135-Degree Split Point Technology: Features a split point that prevents bit walking and ensures precise hole placement, reducing skidding and improving drilling accuracy on hard and slick surfaces.;Efficient Chip Removal: The reverse spiral combined with optimized flute geometry allows for faster chip evacuation, reducing heat buildup and maintaining consistent drilling performance during extended periods of use.;Organized Storage Solution: Comes with a durable metal storage case that securely holds each drill bit in labeled compartments, allowing for quick size identification and protecting the bits from damage during transport or storage.;Designed for both professionals and DIY enthusiasts, this left-hand drill bit set delivers unparalleled performance in demanding applications. Crafted from M2 high-speed steel with a titanium nitride coating, each bit withstands wear and heat while maintaining its sharpness. The 135-degree split point ensures precise, stable starts, and the reverse spiral aids in extracting damaged fasteners. Ideal for use on hardened metal and stainless steel, this set includes a robust metal case for organized, long-lasting storage. A reliable choice for mechanics, fabricators, and repair specialists who need dependable tools on the job.