Milwaukee Step Bit PG7-PG21 (28mm)

In the realm of step drill bits, the Milwaukee Step Bit PG7-PG21 (28mm) presents itself as a versatile and robust option for anyone looking to drill through various metals. With a model number 48-89-9321, this tool promises a blend of precision, durability, and ease of use, making it an intriguing choice for both professionals and DIY enthusiasts.

When I first got my hands on this step drill bit, the construction and design immediately caught my attention. The bit is crafted from high-speed steel, a material known for its robustness and longevity. The high-speed steel ensures that the bit can withstand the rigors of drilling through tough materials without wearing down quickly. Additionally, the black oxide finish not only gives the bit a sleek look but more importantly, it serves a functional purpose by resisting corrosion.

One of the standout features is the single cutting edge design. This design choice is not just for aesthetics; it plays a crucial role in providing better control during drilling. As someone who has dealt with bits that wander or create uneven holes, the single cutting edge of this Milwaukee bit offers a refreshing change. It allows for more accurate holes and a cleaner finish, reducing the need for additional clean-up or re-drilling. This is especially beneficial when working on projects where precision is paramount.

The Speed Start Tip is another feature worth mentioning. This tip reduces bit walking, a common issue where the bit skids across the surface before it starts cutting. In my experience, this feature worked impressively well, ensuring that the bit started cleanly and stayed on target. This is particularly useful when working on delicate or polished surfaces where any stray marks can be an eyesore.

Switching between different sizes is a breeze, thanks to the laser-etched markings. These markings are clear and easy to read, even after multiple uses. This might seem like a minor detail, but it significantly enhances the user experience by eliminating guesswork and ensuring you always know which size you're working with. The bit covers a size range from PG7 to PG21 (28mm) with increments of 1/16", offering ample versatility for various applications.

The 3-flat shank design is another thoughtful inclusion. This design prevents the bit from slipping in the chuck, providing a secure grip and reducing the chances of any mishaps. Whether you're using the bit in a handheld drill or a drill press, the shank design ensures stability and consistent performance. Moreover, the 1/4 in. hex shank facilitates quick bit changes, saving you time and effort during your projects.

However, it's not all sunshine and roses. In my testing, I did encounter some challenges when drilling through regular construction steel, specifically S235. Despite using slow speeds and proper lubrication, the bit became dull after only a couple of holes. This was somewhat disappointing, given Milwaukee's reputation for quality and durability. While the bit performed admirably in softer materials like plastic, its performance in harder metals left something to be desired.

That being said, the bit's performance in softer materials was nothing short of stellar. It cut through plastic like a hot knife through butter, providing clean and precise holes without any signs of wear. This makes it an excellent choice for projects involving plastic or other softer materials where the bit's longevity is less of a concern.

In terms of value, the Milwaukee Step Bit PG7-PG21 (28mm) offers a lot of bang for your buck. Its combination of features, such as the single cutting edge, Speed Start Tip, and laser-etched markings, make it a highly functional and user-friendly tool. While it may not be the best choice for heavy-duty metalworking, it excels in applications involving softer materials and offers a reliable option for general use.

In conclusion, would I recommend the Milwaukee Step Bit PG7-PG21 (28mm)? The answer is a qualified yes. If your primary use involves softer materials like plastic, this bit is a fantastic choice that offers precision, ease of use, and durability. However, if you're looking for a bit that can handle heavy-duty metal drilling on a regular basis, you might want to explore other options. The bit's performance in harder metals doesn't quite match its otherwise impressive feature set, which could be a deal-breaker for some users.

Overall, the Milwaukee Step Bit PG7-PG21 (28mm) stands out as a versatile and user-friendly tool that excels in the right conditions. Its thoughtful design and robust construction make it a valuable addition to any toolkit, provided you keep its limitations in mind.