Precision and Durability: PTSLKHN hex head drill bit set are made of high-quality S2 alloy steel, processed using CNC precision technology, and undergo a special heat treatment process that gives them a hardness of 58-60HRC. This ensures long-lasting durability and precision, even under heavy use.Easy Identification and Use: Allen wrench bits for drill Each bit is clearly marked with laser etching, making it easy to identify the size and type of bit you need. The magnetic feature also makes it easier to handle and use the bits without worrying about them slipping out of place.Versatile and Widely Used: This Metric & SAE hex driver set is ideal for a wide range of applications, including DIY projects, automotive repairs, woodworking, and more. This hex key drill bit set provides the versatility you need to tackle any job.Convenient Storage and Organization: The black phosphate treatment of the allen key drill bit set not only provides additional protection against corrosion but makes them easy to spot in your toolbox. The allen bits come neatly organized in a compact box, making it easy to store and transport them wherever you need them.Satisfaction Guaranteed: We stand behind the quality and durability of our products, which is why we offer a money-back guarantee. If you're not completely satisfied with your purchase, we'll give you your money back – no questions asked. This means that you can buy with confidence, knowing that you're getting a high-quality product that's backed by a reputable company. Product Description Processed using CNC precision technology Even under heavy use Undergo a special heat treatment process that gives them a hardness of 58-60HRC. Laser marking for easy identification And the black phosphate treatment provides additional protection against corrosion Can be used with electric impact wrenches or manual bits wrenches 1 High precision 2 Good durability 3 Laser Marking 4 1/4" Quick Release Shank