11piece magnetic screwdriver bit set with sizes up to T40, offering versatile compatibility for a wide range of screw types and precise fit for various screws. Material and finish: heat treated S3 steel with a mirror polished finish that enhances wear resistance, delivering long lasting performance for all projects. Magnetic hold: each bit includes a magnetic feature to securely hold screws in place, enabling easier work in tight spaces and preventing screws from dropping during use. Performance and compatibility: designed for torque and precise tightening without damaging screws or bits, suitable for a broad set of tasks and compatible with common driver systems. Applications: ideal for furniture assembly, automotive repairs, and home DIY projects, providing reliable performance across multiple tasks. Use scenarios: 1) Assembling flat pack furniture such as dressers or bookshelves where secure alignment and minimal screw loss are important. 2) Automotive interior work, including dashboard or trim installation, where working in confined spaces benefits from magnetic screw retention. 3) General home improvement and cabinetry projects, such as mounting shelves or assembling cabinets, requiring precise tightening and durable bits.