Milwaukee Cobalt Step Drill Bit #9 (7/8-1-1/8")

In the world of metalworking and drilling, a reliable step drill bit can be a game-changer. I recently had the opportunity to work extensively with the Milwaukee Cobalt Step Drill Bit #9 (7/8-1-1/8") and found it to be a remarkably effective tool across a variety of applications. From cutting through mild steel to tackling stainless steel, this bit consistently impressed me with its performance and versatility.

Design and Build Quality

One of the first things that caught my attention was the quality of the construction. Milwaukee has a reputation for making durable tools, and this step drill bit is no exception. The cobalt construction promises a long lifespan, especially when used in tougher materials like stainless steel. The cobalt alloy used in this bit is known for its high resistance to heat and wear, making it particularly well-suited for drilling through hard metals.

The bit features a dual-flute design, which is engineered for improved heat management. This design helps to keep the bit cooler during extended use, which in turn prolongs its life. The flutes are elongated, allowing for efficient chip removal, which is crucial when drilling through materials like metal and plastic.

Performance

From the moment I started using this step drill bit, it was clear that it was designed with precision and efficiency in mind. One of the standout features is the Rapid Strike tip, which makes for faster and more accurate starts. I found that I didn't need to use a pilot hole in most cases, even when drilling into tougher materials like stainless steel.

During my time with the bit, I drilled over 1000 holes in mild steel without noticing any significant wear. The bit maintained its sharpness and continued to perform impressively. The transitions between steps are smooth, which is a critical factor when you need a clean and precise hole. The smaller steps provide a smoother drilling experience, reducing the likelihood of snagging or catching.

Ease of Use

Another aspect that I appreciated was the ease of use. The bit is compatible with cordless drills, which adds to its versatility. The 3-Flat Secure-Grip shank is a thoughtful addition, as it minimizes bit slippage within the chuck. This feature is particularly beneficial during high-speed drilling, where maintaining control is essential.

The laser-engraved reference marks on the bit are a small but significant feature. These marks make it easy to identify the hole size, which saves time and reduces the risk of errors. I found these markings to be especially useful when working on projects that required multiple hole sizes.

Versatility

I tested the Milwaukee Cobalt Step Drill Bit on a variety of materials, including mild steel, stainless steel, plastic, and even plywood. In each case, the bit performed admirably. For instance, when drilling through 1/2-inch thick plywood and 1/8-inch ABS plastic, the bit delivered clean and precise holes without any issues.

One of the more practical applications I found for this bit was in making holes in PVC project boxes. The ability to easily switch between different hole sizes without changing bits was incredibly convenient. This versatility makes the Milwaukee Step Drill Bit a valuable addition to any toolkit, whether you're a professional metalworker or a DIY enthusiast.

Durability

Durability is always a concern when it comes to drill bits, especially those used in tough applications. In my experience, the Milwaukee Step Drill Bit holds up remarkably well. The cobalt metallurgy ensures that the bit remains sharp and effective even after extensive use. I did encounter one instance where the bit broke while drilling through stainless steel, but I believe this to be an isolated manufacturing defect rather than a reflection of the tool's overall quality.

Recommendations

Given my experience, I wholeheartedly recommend the Milwaukee Cobalt Step Drill Bit #9 (7/8-1-1/8"). It combines durability, performance, and ease of use in a way that few tools do. The high-quality construction and thoughtful design features, such as the Rapid Strike tip and dual-flute design, make it a reliable choice for both professionals and DIYers.

The bit’s versatility across different materials and its compatibility with cordless drills add to its appeal. The laser-engraved reference marks and 3-Flat Secure-Grip shank are practical features that enhance usability. While there was one instance of breakage, I believe this to be an anomaly rather than a widespread issue.

In conclusion, if you are in the market for a high-performing, durable step drill bit that can handle a range of materials, the Milwaukee Cobalt Step Drill Bit #9 is an excellent choice. Its combination of innovative design and robust construction makes it a tool that you can rely on for a wide variety of drilling tasks.