Professional 42piece bit and socket set Includes bits and sockets made of strength alloy steel in 42 types and sizes for slotted, Philips head, hex, Torx, and star screws; suitable for and assembly work in electronics, automotive, furniture, and engineering. Durable steel construction Bits are made from quality alloy steel with hardness; wearresistant and able to retain sharp edges under demanding conditions; reliable performance for professionals and DIY enthusiasts. Efficient ratchet mechanism Ergonomic handle with smooth onedirection ratchet function reduces hand fatigue during prolonged use and increases work efficiency by minimizing revolutions per screw operation. Tidy storage and portability Compact case measures 18.0 x 13.5 x 3.5 cm with designated compartments to protect components, keep tools organized, and make transport easy for workshop, garage, or mobile work. Use scenarios Electronics and maintenance: suitable for assembling and disassembling small devices, circuit boards, and connectors. Automotive and furniture work: ideal for quick repairs and assemblies requiring a variety of screw types and sizes. Home improvement and engineering projects: supports general screw driving and item assembly across a range of tasks.