- Designed for hand drills (550W and above), this step drill bit set is perfect for creating holes with a diameter greater than 14mm in materials with a hardness of stainless steel below 25 degrees. - Utilize water during drilling to cool the bit, significantly extending its lifespan. Applicable speed range is 250-400 RPM for optimal performance. - Features a new 6-piece step drill set made from HSS 4241 steel and coated with cobalt, minimizing friction and promoting cooler operation. This set replaces 50 traditional drill bits, streamlining your toolkit and saving space. - The two-flute design enhances cutting speed and smoothness. Large bits feature a 3-sided shank, while smaller bits come with a hex shank to prevent slippage in your drill chuck. - Crafted from cobalt steel with a titanium coating, these bits offer outstanding durability and maintain sharpness over time, ensuring reliable performance for years. - Ideal for cutting holes in a variety of materials including carbon steel, brass, wood, and plastic, making it versatile for both professional and DIY projects. Use Cases: 1. Perfect for construction professionals needing to drill precise holes in metal frames. 2. Excellent choice for woodworking enthusiasts looking to create clean holes in wood without drama. 3. Effective for DIY projects involving plastic piping repairs or installations, ensuring clean cuts without damaging the material.