Milwaukee #7 Step Drill Bit, 7/8" Single Hole

Milwaukee's #7 Step Drill Bit, measuring 7/8", is a versatile tool marketed for drilling holes in both metal and plastic. With features like a dual-flute design, a Rapid Strike tip, and a Secure-Grip shank, this bit promises enhanced speed, control, and durability. However, like any tool, real-world performance can sometimes deviate from manufacturer descriptions. Here's my in-depth look at this step drill bit based on my own use.

Initial Impressions and Features

On unboxing, the first thing I noticed was the heftiness of this bit. It feels solid and well-crafted, living up to Milwaukee's reputation for quality. The dual-flute design is apparent, offering an immediate sense of added capability. The bit also has laser-engraved reference marks, which, although useful, might wear off over time.

The Secure-Grip shank is another feature that stands out. It's designed to reduce slippage, and it certainly feels more secure in the chuck compared to some other bits I've used. However, a hex shank might have offered even better security, especially for high-torque applications.

Performance in Thin Materials

The primary purpose of this step drill bit is to drill a 7/8” hole in thin materials, and it does this exceptionally well. I started by testing it on sheet metal, marking the starting point with a center punch. The Rapid Strike tip indeed provides quick, accurate starts, and the dual-flute design helps in maintaining control and speed as promised. The step feature is a significant advantage, eliminating the need for multiple drill bits to achieve the desired hole size.

While drilling, I found that applying moderate pressure yields the best results. Excessive force can cause the flutes to snag, particularly at the start of each step. This is something to keep in mind to avoid any potential mishaps.

Performance in Thicker Materials

When it comes to thicker materials, the bit's shorter length becomes a limitation. Drilling through 1” angle iron was relatively easy, thanks to the Rapid Strike tip. However, I noticed that anything thicker than ¼” results in a stepped hole, as the next largest segment begins to enter the hole. This can be both a limitation and a feature, depending on your requirements.

One of the standout features is the bit's ability to chamfer holes. By simply using the next diameter step, you can effectively deburr the hole, resulting in a cleaner finish. This is particularly useful when working on metal, and the chamfers produced were smoother than when using a dedicated chamfering bit.

Durability and Edge Retention

Durability is where opinions might diverge. In my experience, the bit performed well and showed minimal signs of wear after extensive use in an electrical job, drilling numerous holes for cable clamps and conduit connectors. However, other users have reported issues with the bit dulling quickly, especially under high-speed conditions.

It's crucial to use the bit at low speeds when drilling metal. High speeds cause excessive heat, which not only hardens the metal but also dulls the bit. Proper care and usage can significantly extend the bit's life, but it's clear that experiences may vary based on individual use cases.

Areas for Improvement

While the Milwaukee step drill bit has numerous strengths, there are also areas for improvement. The laser-engraved markings, although initially helpful, could wear off with frequent use. A more permanent marking method would be beneficial.

Additionally, while the Secure-Grip shank is a good feature, a hex shank would provide even better grip and prevent any chance of slippage, especially under high-torque conditions. The bit also tends to struggle with thicker materials, which might limit its versatility for some users.

Conclusion and Recommendation

In summary, Milwaukee's #7 Step Drill Bit is a well-crafted tool that excels in drilling precise holes in thin materials. Its dual-flute design, Rapid Strike tip, and Secure-Grip shank make it a reliable choice for both metal and plastic applications. The ability to chamfer holes adds another layer of utility, making this bit a valuable addition to any toolbox.

However, it's essential to use the bit correctly to maximize its lifespan. Low-speed drilling and moderate pressure are key to preventing premature dulling and breakage. While some users have reported durability issues, my experience has been largely positive, provided the bit is used as intended.

Would I recommend this step drill bit? Yes, but with some caveats. If you're primarily working with thin materials and can follow best practices for use, this bit will serve you well. However, if you need to drill through thicker materials frequently, you might need to look for a longer step drill bit or be prepared for the limitations this one presents. Overall, Milwaukee delivers a professional-grade tool that, with proper care, can be a reliable part of your toolkit.