HIGH DURABILITY - Made from premium Chrome Vanadium steel with Black Phosphate Coating for durability, this set resists abrasion and corrosion, ensuring long-lasting performance in various tasks. STRONG MAGNETISM - The magnetic feature ensures secure and effortless installation or removal of hexagonal nuts and fasteners, enhancing your work efficiency and ease of use. VERSATILE USE - This 12-piece set includes both SAE and metric sizes, making it perfect for a wide range of applications. Compatible with impact drills, bit drivers, and hex socket ratchets.