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

Unreal quality for a great price. Leaves a great edge finish. No tear out or splinter. This is the 3rd brand of compression spiral I have tried and this one is far superior from the others. Used for several projects and havent seen any decline in the performance. Definitely recommend this product.

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 used this bit for the first time to clean up the edges of a CNC carving. I purposely cut too shallow with the CNC into a piece of walnut, then cut the carving out with a jab saw. This to me provided the worst possible scenario I could come up with regarding the wood. Hard wood with jagged overhangs that have been stressed already, and a curved edge. As for the router, I used a cordless handheld DeWalt 1/4 in router. Its large in the hand so kinda hard to hold and it is easier to accidentally tilt than a larger router. Then I flushed the corners holding the router in one hand and the carving in the other. This was the worst possible scenario I was willing to tolerate. I got the best results I have ever gotten from any flush trim bit - with the worst conditions I could come up with. There was zero tearout, and perfect alignment. Look at the pictures, they speak for themselves. I hate to write gushing reviews, but this is a standout tool that radically outperforms every other version of the tool I have ever used. Cant recommend this bit highly enough.

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 bit is only used to produce repeatable results using a pattern attached to the workpiece as a guide. A bearing is used to follow the pattern and neither the process or this type of router bit are anything new. What sets this bit apart is that it cutting edges are slightly angled to slice both up and down. This results in a shearing cut rather than a chipping cut and should produce a smooth cut with little or no chip-out - well see. This is also a small diameter bit. Itll get into tighter areas, but its small size requires a bit more time and patience. You cant force this bit because its cutting tip speed is much slower than a bit of larger diameter. Both rotate at the same RPM, but the larger bit has to move faster around a larger circumstance. This little bit has the potential to produce edges ready for finish, but you cant rush it. Its also important to rough-cut work pieces very close to their finished size because you cant hog material with bits as small as this. This bit is for the last 1/8 give or take, youre not going to plow with it, at least not very far before it breaks from heat buildup. Use it as intended and with care and it shouldnt disappoint.

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.

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.

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.

Having once snapped a premium 3/8 inch spiral on its second use, I’ve managed to suppress any interest in a long, tiny 1/4 inch one. The opportunity to test one through the Vine program overcame a couple of decades of reluctance, and, with less than an hours use, trepidation has transformed to enthusiasm. This is one useful bit. Not surprisingly, it allows me to enter smaller spaces for interior cuts, and to follow more finely detailed templates for external cuts than I could ever hope to achieve with a larger bit. The up/ down spiral does indeed leave a far smoother finish—top, bottom, and in between—than I can achieve with my straight bits. I have used it only for light, slow cuts with the same knowledge “Amazon Customer” shared in his/her January 9th review, which I recommend reading. As others, I still worry the 1/4 bearing is going to hold up. I wish they had included 3-4 replacements with the bit. Time will tell if my concern is warranted, but over that time I’ll be checking often to ensure the bearing rotates smoothly.. I won’t be using this bit often, so it may be some time before I can report on actual bearing life. For now, I can only affirm others in their praise for this bit. It is well worth its modest price,

Hmm, well this has a good cutting edge, seems to make a perfect edge, no wobble in the bit and good longevity. Good buy when compared to the same bit I got from HD at a better price.