10 PCS Impact Torsion Insert Bit Set Tool Screwdriver Insert Bits

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