High Quality: These screwdriver bits are made of CRV steel, with hardness HRC 52-56, for long-lasting use. Precise Design: The precision screwdriver features a 3-level adjustable pole and magnetic head for easy operation. The handle is ergonomic, slip-resistant, and comfortable to hold. Includes 30 screwdriver bits: Five-star: 0.8, 1.2; Torx: T1, T2, T3, T4, T5, T6, T8, T10; Triangle: 2.0, 2.3; Y: 0.6, 2.0; Cross: 1.5, 2.0, 2.5; Flat: 1.2, 1.5, 2.0, 2.5, 3.0; SIM-Card: 0.8; Allen: H1.3, H1.5, H2.0, H2.5, H3.0, H4; U: U2.3 Portability: Plastic storage box holds the screwdriver bits, easy to carry, and keeps each bit secured in its holder. Use scenarios: - Electronics repair and device maintenance, including handling small screws, SIM cards, and delicate components. - Furniture assembly and general home DIY projects requiring a range of bits and torques. - Small appliance and automotive electronics maintenance, where a compact, versatile bit set is convenient.