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Precision Controlled Heat for Extreme Durability and Wear Specifications: T3 T4 T5 T7 T8 T9 Material: CR-V Surface Electroplating Description： Easy to use and durable Gunmetal Grey size: 28mmx4mm Made From S2 Modified Steel for Performance and Durability 10Pcs Insert Bit Set Tool Screwdriver Insert Bits Broken Screw Extractor Titanium Rod Eyes Aluminum Carbide Burr Set Long Shank Bit Set