This HPHOPE hex bit set has everything you need for drill and screwdriver projects! You get 20 pieces total - 10 metric sizes from 1.5mm to 8mm and 10 SAE sizes from 5/64” to 5/16”. The 50mm length provides good reach, and they all come in a handy storage box that keeps everything organized. Made from high-quality S2 alloy steel, these bits are seriously durable. They undergo CNC machining for precision tips, black phosphate coating for corrosion resistance, and high-temperature quenching for enhanced strength and lifespan. The 1/4” hex shank works with quick-release chucks on all cordless screwdrivers and drills, making bit changes fast and easy. The strengthened magnetic tips are super helpful for picking up screws and keeping them secured during driving - and the magnetism doesn't fade over time. Whether you're doing household DIY, woodworking, automotive repairs, or professional machinery work, this set covers the most common hex sizes you'll encounter. The bits work with air screwdrivers, electric screwdrivers, and manual screwdrivers with compatible chucks. If you're tired of searching for the right allen wrench or dealing with loose bits that don't grip properly, this complete set delivers professional quality at a very reasonable price. The organization box alone is worth it for keeping your workspace tidy!