1.The Ultimate Set: 236 pieces including Nut Drivers, Security Bits, Torx, Slotted, Phillips, Square, Pozi, Hex, Socket, microbits, and other specialty bits in commonly used sizes. Also includes Magnetic Bit Holder, Quick-Change Adapter for fast and easy switching between sizes, a ratchet wrench, and a flexible shaft bit holder for working in hand to reach spaces 2.Exceptional Quality: Bits are made of high-grade carbon steel (50BV30 & 6150 Grade) and sand-blasted for optimum strength and longevity. 3.Built For Work: Comes in a sturdy, hard-shell case with labeled slots to keep bits organized. Includes multiples of the most common sizes so you can keep working. 4.Practical and Versatile: Use with your drill or impact driver - perfect for DIY projects, with professional results. Use for household maintenance and repair, and so much more.