Titanium Nitride Coated Drill Bits: Enhanced with a titanium nitride coating, these high-speed steel drill bits offer increased surface hardness and reduced friction, allowing for smoother drilling and extended lifespan in high-torque applications.;Left-Hand Drill Functionality: The left-hand rotation design is specifically engineered to work in conjunction with screw extractors, enabling easy removal of seized or broken screws without damaging surrounding materials.;Precision 135-Degree Double-Edged: Each drill bit features a 135-degree double-edged tip for self-centering performance, minimizing walking and delivering clean, precise holes in metal and other dense materials.;Optimized for Tough Materials: Designed to effortlessly tackle hardened metal, stainless steel, and cast iron, this set provides consistent cutting performance even under challenging conditions.;Secure Index Storage Case: The included metal case features clearly labeled compartments for each drill bit, ensuring organized storage, easy access, and protection against corrosion and physical damage.;This high-performance left-hand drill bit set is built to handle the toughest fastener removal tasks. Crafted from M2 high-speed steel and coated with titanium nitride, the bits resist heat and abrasion while maintaining cutting efficiency. The left-hand threaded twist and 135-degree tip ensure precise engagement and effective extraction of damaged screws. Whether you're working on automotive repairs or industrial maintenance, this set offers durability and reliability. The compact index storage case keeps your tools organized and ready for any job, making it an essential addition to your toolbox.