Up Down Compression Spiral Flush Trim Router Bit, 1/4 Inch Shank Solid Carbide Flush Trim Router Bits CNC Spiral Bit with Nano Coating by EANOSIC

This is my first experience with an up down compression spiral flush bit. It did not disappoint. So far, I’ve only used it in testing and one small project, but the results have been very encouraging. Plywood trims were clean with no significant chipping. Softwoods like fir and cedar trimmed clean and smooth. I used it with my trim router and, as another reviewer has stated, a larger base would be helpful. I did get a few waves but that was entirely due to my too-casual technique at the time. Key unresolved issue is longevity of the product. So far I’ve seen no red flags in that regard and expect this bit to serve my purposes for many years to come. If that should change, I will update my review.

I have a triple fluted flush cut 1/4 inch router bit that I usually use in my construction business. I have never used a spiraled flush cut bit, so I thought it might be fun to try out. I used this spiraled flush cut bit it my trim router at first and the bit had no problems cutting 3/4 pine trim boards. However, I did notice that the cut was a little wavy because the trim router has a small base plate so I tried it in my full sized router with a 5ish plate. The cut came out much straighter and I would recommend using a bigger base plate for it unless it doesnt matter if there are a few waves in the cut. It cut through 5/8ths OSB plywood and didnt leave any burrs on the surface. There were some on the bottom of the plywood but I assume that is from the spiral moving downward. I like the fact that the bit is only 1/4 in diameter the whole length and that it doesnt have to take out as much material as my 1/4 fluted bit that is 1/2 at the cutting blades. So far... I really like this bit and am hoping that it stays sharp for a long time so I can use it for many years.

I have a couple of bits from this company, and I’m impressed with the quality. This particular 1/4” bottom bearing flush cut bit is a useful size for following tight patterns or for trimming flush to another piece. You do need to make sure your pattern is accurate and smooth as any imperfections will show, given the small bearing diameter. I’d consider this a tool for precision work, rather than hogging out the edges of countertops- solid carbide is not for forcing, and the 1/4” diameter means you need to take it slow. If you have never experienced the improved quality of cut from a good spiral ground router bit, you should give this a try.

This ball bearing router bit came very sharp and did a great job cutting veneer with minimal chipping or tear out. The ball bearing allows you to precisely follow a template or guide to make perfect, repeatable trims/cuts. My only observation is that for the price, this single bit was a little expensive. Overall though, it performs as advertised and did the job for me.

As it is an off brand from Amazon, I dont have high hopes for longevity. That being said, for a hobbyist the price is right and it works great so far. Only time will tell on durability.

EANOSIC Up-Down Compression Spiral Flush Trim Router Bit Versatile dual ball bearings allow for flush cutting as well as template use. The EANOSIC Up-Down Compression Spiral Flush Trim Router Bit is a versatile and durable tool for template cutting and flush cutting. The 1/4 inch shank and solid carbide construction make it suitable for a wide range of applications from hard and soft wood to plastic. The nano coating on the bit provides added durability and resistance to wear and tear. The unique feature of this router bit is its up-down compression design which helps to compress the material being cut, which results in a smooth and splinter-free finish. This saves a lot of sanding. This router bit is especially great for template cutting projects as it provides a precise and accurate cut every time, following the template perfectly. Exceptional value for the price. EANOSIC makes exceptional router/CNC bits!

I am giving this particular bit 3 stars, because it could have been a rare manufacturing flaw. I used it on a 1 inch cherry wood removing about 1 to 2 mm, and after about 5 minutes and 2 feet it fell apart. Luckily I had an upcut bit by the same manufacturer that I used to finish the work. The other bit performed perfectly.

This bit is 1/4 from head to toe. So the bearing is also 1/4. Ive never seen one this small. Who knows how long it will last? Ill update if there are any problems. The blue coating and/or the flute design makes this bit cut very clean! For the few materials I tried, there were no blowouts or chads left hanging on top or bottom! I didnt have any kind of chatter or wobbling that I expected. However with the tiny bearing diameter, it will definitely transfer smaller imperfections from your template to the workpiece. More so than with a 1/2 bearing. This is just a lot easier to work with. I think youll have to be careful not to rely on bit color to tell you when youre making too much heat. You wont see discoloration on this coating. I guess youd have already made way too much heat if your bit was bluing. Best to keep your pass speed under control anyway.

A spiral flush-trim bit such as this is a somewhat newish design that combines features and benefits of both upcut bits and downcut bits. And flush trim means that this bit is designed to follow a pattern along its bearing, to allow the material above the pattern to be cut flush to that pattern. You don’t want to ask a bit such as this to hog off much material; it’s forte is trimming small amounts smoothly even with sheet goods and areas of changing grain direction. So use your saw to cut close to the line, and this bit to just make that last 1/16” tight to the line and smooth. I can’t say that I have past experience with this company, but this bit does a nice job for a very good price and I would buy one of these again. I’ll update this if the bit seems to not hold up well! I hope this review has been helpful to you!

This is the first spiral bit Ive used, and I gotta say Im a convert. It just chews through material, and produces a nice clean edge. Im very pleased with this.