EANOSIC Upcut Spiral Router Bit 1/4 inch Shank, 1/4 inch Cutting Diameter, Extra Long 3 inch Solid Carbide with Nano Blue Coating CNC Router Bits End Mill for Wood Cut, Carving

While not a terrible bit it isnt any better than a standard straight 2 flute carbide bit. I was working with 3/4 ash, prepping it for gluing into panels. This bit was ok for light cleanup on the edges but thats about it, maybe removing 1/32 or 1/64 of an inch.

I bought this bit rather than others of the same style because I needed the extra length. I was concerned about the durability due to the extra length of the bit. It has performed as expected, and hasnt broken. And has stayed sharp. A very good buy.

I used this bit in my large woodworking CNC machine. The photo of the circular cuts is a test pattern I use for calibrating Z-steps. There is some tearing on the edges of the circles, but these cuts are in hardwood plywood and I expected this. The second photo is a close-up of a 1/4 slot cut into 3/4 plywood into which some 1/4 plywood will slide. The groove is plenty clean for its intended use in a cabinet carcass.

The edges on this bit are very, very sharp, so be sure to take care when handling it. Its all too easy to slice yourself when taking the bit out of its case, or installing/removing the bit from the router. Used this bit to rout cutouts in copper countertops (the copper layer is about 1/32 thick). Even with a good bit, it is slow work, but this bit did the job, and left a nice clean edge on the cutout.