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These spiral bits are great for mortising or general plunge or dado/rebate cutting. Usual high quality freud bit. Produce a cleaner edge than regular staright flute bits and with better debris removal.
I used a dial caliper, and measured the difference between the template guide collar, and the edge of the bit. The 1/8" is small, and usually used for inlays and such. I guess perfect walls on a tenon that won't be seen when they are glued together, is not that important, but a perfect fit is. The shaft is 1/4" and the tip is 1/8", so you can not plunge the bit as deep as the shaft will allow. I have since learned to use, one or a pair of Tru-Grip guides, with a stop. No chisel made pockets for the glue to fill. Anyhow on to the bit. Good to know when making deep mortises.
Freud makes a very nice bit, and this one is very sharp, and will last a long time. After a lot of careful cutting, I made a snug fit template, which resulted in a snug fit mortise. My first introduction into mortise and tenon joinery was with a flute up spiral bit, and a self built template, made from 1/4" plywood. A lot less set up time, and the same results. The beautiful thing about flute up spiral bits, is that they cut the sides of your tenon, and the bottom of the tenon perfectly smooth.
On a 1/4" bit with a 1/4" shaft, or a 1/2" bit with a 1/2" shaft, you can plunge an even cut as deep as the shaft. I love old world techniques, but a flute up spiral bit, is your best bet. Then I added that to the size of the opening-mortise, I wanted to make. Even if you are making multiple passes, you don't see a seam line. Highly recommended.
This will give you a perfectly straight even tenon.
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