I read an article on making boring tools and with some additional answers to questions I asked on Sawmill Creek I decided to give it a try. These tools really work great and hog out the wood. I have less than $20 invested and enough material left over to make a couple more with curved shanks. The shanks are 1/2" steel and the bits are 3/16" HS tool bits. The bits are easily to grind to any profile you like and easy to sharpen. You can see I didn't spend a lot of time on the handles. I find that I also use them in spindle work.