Hex Shank Nitrided Black HSS Step Drill Bit Set (3-12, 4-12, 4-20mm)

This versatile step drill bit set is crafted from High-Speed Steel (HSS) with a durable nitrided black coating, ensuring longevity and resistance to wear. Designed with a hex shank for improved grip and stability, these bits are perfect for precise drilling in various materials. The set includes three pieces with sizes ranging from 3-12mm, 4-12mm, and 4-20mm, making it ideal for enlarging existing holes and handling a variety of tasks with ease. Its efficient design allows for smooth drilling and burr-free holes, making it an essential addition to any DIY enthusiast or professional tool kit. ``` Material: HSS, Nitrided Black Shank: Hex Size: 3-12mm, 4-12mm, 4-20mm ``` Manufacture country: China Instructions included: No