Milwaukee Step Drill Bit Set, 3-Piece, Sizes 4-12 mm, 4-20 mm, 6-35 mm

The Milwaukee 3-piece step drill bit set is a professional-grade solution designed for versatile drilling applications in metal and other materials. Featuring a specialized stepped geometry, these bits allow users to drill multiple hole diameters using a single tool, significantly increasing efficiency on the job site. Each bit is engineered for durability and precision, ensuring clean, burr-free holes even in demanding industrial environments.

Advantages

The primary benefit of this set is its ability to replace multiple standard drill bits with just three versatile tools. The stepped design facilitates smooth transitions between hole sizes, reducing the need for frequent tool changes during complex projects. These bits are constructed from high-quality materials that resist heat and wear, maintaining their sharpness over extended use. Furthermore, the design minimizes vibration and prevents walking, which results in higher accuracy and cleaner finishes on every hole drilled.

Suitable for

• Drilling holes in sheet metal and thin-walled materials
• Electrical installation work for conduit and cable entry
• Plumbing tasks requiring various pipe diameters
• General metalworking and fabrication projects

When it may not be suitable

This set is not intended for drilling through thick, hardened steel or masonry materials, as the stepped design is optimized for thinner gauge metals. It is also not suitable for use in impact drivers, as the high torque can cause damage to the bit geometry.

Key specifications

• Set includes three sizes: 4-12 mm, 4-20 mm, and 6-35 mm
• Stepped design for multiple hole diameters
• Optimized for clean, burr-free drilling
• Designed for professional metalworking applications

How to use

To use these step drill bits, secure your workpiece firmly to prevent movement. Select the appropriate bit size for your target hole diameter and insert it into a standard drill chuck. Begin drilling at a moderate speed, applying steady, consistent pressure. Allow the bit to cut through the material without forcing it, as the stepped design will naturally guide the hole size. Ensure the drill remains perpendicular to the surface to maintain precision.

What to consider before purchase

• Check the maximum material thickness capacity of your specific application
• Ensure your drill chuck is compatible with the shank size of these bits
• Verify that the material you are drilling is within the recommended hardness range for high-speed steel step bits

Usage recommendations

For optimal performance and longevity, use a suitable cutting oil or lubricant when drilling into metal. This reduces friction, dissipates heat, and helps maintain the sharpness of the cutting edges over time.