SpeTool Upcut Spiral Router Bits Extra Long (4 inch) with 1/2 Inch Shank , 1/2 Cutting Diameter Solid Carbide CNC Router Bits End Mill for Wood Mortises and Cutting Dadoes Carving

I was very impressed with the quality of the cuts and the outstanding fit of the parts. Im making 6x6 pergola posts using 2x6 #2 lumber. By machining one surface flat on the planer and then laying the flat side down on the CNC table, I get perfect dadoes and rabbets which perfectly interlock.

Absolutely loved this bit!

Initial impressions are great. Will provide update after 6 months on durability. Made 12 mortises, so far nice results

Excellent edge quality and sharpness. No problem routing 1 3/4 depth red oak with no deflection.

We used this bit in a circle jig to cut 2 thick pieces of poplar. Worked very well and is still sharp after 12 hours of use.

Used it only once thus far. Cutting 2 cherry. Very sharp, low noise, low vibration. Good enough for me.

Did not last long, Started to burn quick

This bit cuts so clean I am very impressed.

Using this on my CNC lathe. Works great. So sharp you need to be careful just handling the bit. (Voice of experience.)

I used this bit in a plunge router to carve deep mortices for concealed door hinges. It worked very well - nice and sharp with no burning. It was easy to plunge, and the finish on both the top and bottom surfaces was pretty good. Its also a really good size - the mortice in the photo is 21mm deep and I had plenty of plunge left and that was with an 18mm spacer!