This 16-piece impact nut driver set is built from industrial-grade chromium vanadium steel with a corrosion-resistant black phosphate finish, ensuring strength and long-lasting durability. Each driver includes a powerful internal magnet that securely holds fasteners and drill bits for stable and efficient operation. The set provides 8 metric sizes from 6 mm to 14 mm and 8 Sae sizes from 1/4" to 9/16", covering a wide range of fastening needs. With an extra-long 6-inch design, these drivers easily reach narrow or hard-to-access spaces, while clear size markings enable quick identification. A durable storage box keeps the set organized and protected, making it convenient to store, transport, and use for professional or Diy applications.