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

Perfectly smooth and fast cut through 2 of Walnut

These router bits are not square. In other words, the top is not perpendicular to the sides so if they are used for something like a dado or finger joint you will not get a square cut. I have tried several and they were all the same.

Super sharp and very accurate. Ive been using it to cut deep mortises in 4x4s. Flawless cuts.

The overall quality is excellent and it cuts Baltic birch plywood very well.

Very impressed for the money

I been using this router bit for years, like the quality and the price, will be buying the same in a regular basis

Im cutting slots in 1.75 Inch Hard Maple and this bit in going thru it well. Im doing multiple passes and getting very good results. Id recommend this bit.

Did not last long, Started to burn quick

The bit is quite the beast. I am just a hobby woodworker and admittedly the bit is handling all that I throw at it. It may not hold up to extended mass production use. But for the purposes of routing out mortises, tenons and rabbets, it does a really good job!

This bit is solid carbide, EXTREMELY sharp, cuts like a hot knife through butter, and is tall enough that you can attach a jig to the bottom of your plunge router and still get to a 1-1/2 deep mortise or maybe a little more depending on how thick your jig base is. Very happy with it.