Spiral Flush Trim Router Bit 1/4 Shank by PROMSA, Ultra-Performance Compression Top Bearing Router Bit, Solid Carbide Trim Router Bits, Flush Cut Router Bit for Wood Trimming, Up-Down Cut

This bit has helped me with tear out when routing the edge of boards. I was using a straight edge trim blade and often experienced wood chipping especially at the edges. This bit is very sturdy and does exactly what I need it to do.

This looks like fantastic quality right out of the box! Razor sharp edge. Smooth bearing. Can’t wait to use this on many more projects!

This sucker is awesome caught myself taking to big of bites for my router but it made short work of the cedar I was working on. I know cedar is soft but the amount of work I did with it and the rough treatment I gave it a lesser bit would have been ruined. Still as sharp as the first cut

Burned up after first use. The price reflects the quality. I didn’t have high expectations given the price point but I expected it to last a little longer.

Great bit, very clean and easy cuts

This bit has appeal for use away from the shop. It cuts as well as a conventional design, but unlike brazed on carbide cutters, this one uses square inserts which are bolted into place, allowing one to rotate the cutter to a fresh edge, or even replace the cutting insert in the field, as well as at the home or shop. The basic design has seen long use in lathe tools and even planer blades, but this is the first time I have encountered it applied to router bits—and I am uneasy with this application. Used with the lathe, there are no rotational forces within the tool itself, and though the cutter is moving when used on planer blades, the speeds are low compared to a router, and the blade assembly is relatively enclosed within the planer. Not so with a handheld router, where the speeds are very high, and the cutter quite exposed. So I’m uneasy about this application. If the bolt should loosen, the bit will become unbalanced and any unbalance will lead to vibration, and that vibration may cause further loosening, potentially resulting in that bolt and cutter becoming harmful projectiles. Perhaps my concerns are unwarranted, but right now, they have not been allayed. As I write this, I find no other reviews of this specific bit. The product page lists several different styles, and the positive reviews are for the fixed blade compression bits. Until I become aware of multiple long term use reports, I think I am going to hold off putting mine to further use.

So, yes, out of the box the cutter did excellent. I rough cut a couple of boards to shape and used a quarter inch thick template and this carbide insert flush trim to finish them off. For me personally this bit will have limited use in my shop since the cutting length is so short, just under half inch. I have many other flush trims, solid carbide, up/down cuts, compressions, etc, all of which are over 1 inch length and make template cutting much faster for thicker lumber. Overall, I cant complain about the bit, because Im sure there are folks who need to flush trim signs and other thin material all day long, but if you are looking for good, versatile flush trim, that will work on thick and thin material, there are much better options out there.

This is a great bit. There are two cutting blades that can be rotated 90º when one side gets a little dull. At first I thought they were the same as the blades on my Wen Planer (would have been convenient) but they are slightly smaller. Still, you can rotate the blades so you have four edges to work with before needing to replace them. The bit works as described and does a great job!

I have a lot of flush trim bits but, since I work with a lot of hardwood, they dull easily. This one rips through hardwood with ease and, since you can replace the blades, should be useful much longer.

Significantly better performance than the cheaper bits with cutter inserts. Hardly any chatter , and clean enough cuts. Great performance removing 1/8 to 1/4 inch or more of material. Maple , sapele , pine , and ash. All verified working well. I’ll be back for more