IMPROVED STABILITY: Our spiral step drill bit is designed to minimize deflection during cutting, offering enhanced stability and accuracy. Ideal for stainless steel, this bit ensures faster cutting speeds and a longer service life than standard step drills. 5PCS NITRIDING STEP BIT KIT: This comprehensive set includes step bits in sizes 3/4", 5/8", 1/2", 3/8", and 1/4". It's perfect for a variety of drilling needs, from home DIY projects to professional tasks. VERSATILE DRILLING CAPABILITY: Capable of drilling through thin metal, copper, aluminum, iron, carbon steel, wood, and plastic, our step drill is a must-have tool for any DIY enthusiast. It's designed to handle a wide range of materials with ease. Color: Black Material: Metal Package Contents: 5pcs M35 Cobalt Spiral Flute Step Drill Bit Set