1pc Screwdriver Handle: Features a quick-release button to securely swap blades and prevent unwanted extraction.1pc Single-Pole Voltage Tester: Used to safely detect live electrical currents.11pcs Interchangeable CrV Blades: Made from Chrome Vanadium steel for high torque.4pcs Slotted: 1.2x6.5x100mm, 1.0x5.5x100mm, 0.8x4.0x100mm, 0.5x3.0x100mm2pcs Phillips: PH2x100mm, PH1x80mm2pcs Pozidriv: PZ2x100mm, PZ1x80mm3pcs Torx: T20x100mm, T15x100mm, T10x100mmKey FeaturesSafety Certification: Every screwdriver is individually tested to 10,000 Volts and manufactured according to international standard IEC60900.Ergonomic Design: The handle features a two-component, anti-roll soft grip engineered for maximum force transmission and comfortable use.Storage: Comes in a durable, molded carrying case to keep the blades and handle