Milwaukee 4-Cutter SDS Plus Rotary Hammer Drill Bits

Working with concrete, especially when it contains rebar, can be a challenging task that demands the right tools. Recently, I had the opportunity to use the Milwaukee 4-Cutter SDS Plus Rotary Hammer Drill Bits, model number 48-20-7344, and I must say, these bits have left a lasting impression.

The standout feature of these bits is the solid head carbide design. Unlike traditional two-sided carbide tips, these bits feature a 4-cutter design that significantly improves durability and performance, especially when drilling into concrete with embedded rebar. The solid carbide head ensures that the bits maintain their edge longer, reducing the need for frequent replacements. Milwaukee claims these bits can last up to five times longer than standard carbide bits, and in my experience, this longevity is not an exaggeration.

Another notable feature is the rebar guards, which are designed to enhance performance when encountering hard materials. These guards are particularly beneficial, as they help prevent the bit from locking up when it hits rebar, a common issue with standard bits. This feature alone can save a lot of time and frustration on the job.

The centering tip on these bits is another thoughtful addition. It allows for precise spot drilling, which is crucial when accuracy is paramount. Whether you're drilling into concrete or metal decking, the centering tip ensures that you start the hole exactly where you need it. This precision is a game-changer, especially in professional settings where even minor inaccuracies can lead to significant problems down the line.

Moreover, the variable flutes on these bits are designed to enhance dust removal and increase drilling efficiency. Effective dust removal is critical not only for maintaining a clean work area but also for keeping the bit cool during operation. This feature helps prevent overheating, which can degrade the bit over time. In practice, the bits did an excellent job of clearing debris, allowing for faster drilling and smoother operation.

One aspect that I particularly appreciated is the wear mark indicator. This small but crucial feature signals when the bit no longer meets ANSI B212.15 standards for common anchors. It's a helpful visual cue that takes the guesswork out of determining when a bit needs to be replaced, ensuring that you're always working with tools that are up to standard.

The bits come in a sturdy, well-designed case that fits neatly in Milwaukee's Packout cases. The organization and portability of the case are definite pluses, making it easy to keep your bits in order and transport them from one job site to another. The case also has room for additional bits, which is a thoughtful touch for those who like to keep all their tools in one place.

In terms of performance, these bits excel in both DIY and professional settings. I used them with a battery-powered SDS drill, and they attached seamlessly. Drilling through concrete and stone was a breeze, and the bits showed no signs of wear even after extended use. The 4-cutter design not only prevented lockup in rebar but also allowed for faster drilling by efficiently removing dust and debris.

For tasks requiring chiseling, the included flat and bull point chisels are made of forged, harder material and proved to be incredibly useful. They made quick work of breaking up small pieces of concrete and mortar, and their durability was evident throughout the process. These chisels are a handy addition to the kit, providing versatility and convenience for various projects.

However, it’s worth noting that not all experiences with these bits were flawless. One user reported that the 5/32-inch bit melted within seconds when used on a concrete wall. While this could be an isolated incident, it highlights the importance of selecting the right bit size and type for specific applications. Additionally, there were a couple of complaints about the high cost relative to other options on the market. While the quality and performance of these bits justify the price for many, budget-conscious users might find it less appealing.

Despite these minor drawbacks, the overwhelming consensus is that these Milwaukee bits are high-quality, durable, and efficient. They perform exceptionally well in demanding conditions, making them a reliable choice for professionals and serious DIYers alike.

In conclusion, I highly recommend the Milwaukee 4-Cutter SDS Plus Rotary Hammer Drill Bits. Their solid carbide head, rebar guards, centering tip, and variable flutes make them a top choice for drilling into concrete with rebar and other tough materials. The durability and precision they offer are unmatched, and the included chisels add valuable versatility to the kit. While they might be on the pricier side, the investment is well worth it for the performance and longevity you get in return. Whether you're a professional contractor or a dedicated DIY enthusiast, these bits are a fantastic addition to your toolbox.