9901HP 1/8 in. Cylinder Shape Tungsten Carbide High Performance Rotary Carving Bit | Titanium Nitride Coating | Tungsten Carbide Construction | Cylindrical Cutting Profile | 35000 RPM Rated

works well.

Nice

Performed even better than I expected for carving out some hardened steel. Easy to control, keeps a clean and sharp edge, and is clearly a well-crafted tool.

Well crafted genuine part. Used to grind down steal gearing and worked very well.

What I liked most about this bit is that it has stayed sharp for a long time. I am a welder/fabricator so I use it to shape steel and grind on welds that are in tight spaces. What I didn't like about the bit was that it was pretty short and any dremel that has the cup around the collet makes it difficult to lay the bit flat to get an even cut. I recommend this bit for all uses but make sure to use the correct speed and pressure. If it shoots sparks that's too much pressure, and if it chatters a lot then increase your speed. It produces a ton of small sharp shavings so make sure to where the proper PPE while using this bit.

This bit is small enough to get into tight spaces, and it works well for both wood and metal. Recently I had to work on a door striker plate whose opening didn't extend quite far enough for the latch to extend into the hole. A few minutes of grinding with this bit opened it enough to let the door close easily.

Disclosure: This was sent to me for free via the Vine program. I did not receive monetary compensation to write this review, just the product itself. I needed a drill bit to drill out some wood on a project I'm working on. It's oak, so it's not the softest wood out there. When this came across this, I picked it up to mill out a small hole in the piece. I figured the tungsten carbide would be able to do a fine job of it. And it did. It's tungsten carbide. Minimal to no tearing on the edges, cut smoothly in latitude, longitude, and depth, and left a clean hole. That being said, I'm conflicted. Sure, it did its job. But the standard bit is $4~ish cheaper and it's tungsten carbide, too. What makes this a longer lasting bit? The titanium nitride coating? Magical Dremel wizards chanting over it before it's packaged? I don't know. A titanium nitride coating won't do a WHOLE lot for shearing forces (forces perpendicular to the axis of the material), it's mainly just a wear prevention coating. I've never had a bit wear out, they always just...break. So what's the "engineering" on this that makes it worth $4 than the standard 9901? It's a good bit, don't get me wrong. It deserves the four stars. But I don't know if I'd buy this over the normal one given how long I've had it, my experience with previous Dremel bit failure points, and the lack of information on what makes it so special. So if you've got some extra pocket change lying around, give this a go. Otherwise, stick with the normal one.

How is skeptical that this would tool would do what I needed? But I gave it a try. I was able to cut out a bad bearing with this tool. The bearing is hard and steel. And this thing did the job? It took a while but it kept going to lose done. This was a great buy.

金属の切削のために購入 切れ味が良いため切削スピードが早くて良いです 使用後にカッターを確認してみましたがコーティング剥がれや欠け等のダメージは見られませんでした

A little pricey but you know what you are getting with Dremel. Good packaging. Tamper proof. Important with these orders. Months later, expected long lifespan, but OK life, it's great but not a professional replacement.

Good product

Works well

Nice authentic Dremel cutter bits!