About this item Multi-Size Set: This 35-piece screw extractor and left-hand drill bit set includes 13 multi-spline extractors, 16 left-hand cobalt drill bits, and 6 spiral screw extractors. A versatile and essential toolkit for handling a wide range of damaged, stripped, or rusted fasteners High Hardness & Durability: Crafted from premium CR-MO steel and HSS materials for superior strength, durability, and corrosion resistance. The spiral design ensures a strong grip for easy removal of stuck fasteners. High-quality materials can be used for fasteners of various metals Wide Application: The multi-spline extractors are ideal for high-torque, low-profile tools, while the bolt extractors are designed to remove partially exposed fasteners. The included left-hand cobalt drill bits assist in drilling into broken or seized fasteners for easier extraction Easy to Store & Carry: All screw extractors and left-hand drill bits are neatly organized in a durable blow-molded case, making storage, transport, and tool selection quick and convenient Reliable Support: We attach great importance to the customers’ satisfaction, if you have any questions, please feel free to reach us by Amazon Overview Material: Black Oxide Finish Type: Uncoated Shank Type: Straight Brand: YEKEPRO Tool Flute Type: Spiral