In article , Harold & Susan Vordos says...

Not thin disks. Narrow tools, just like a commercial parting tool, but
made from various sizes of HSS tool steel. I grind them from 3/8" and 1/2"
square mostly. 1/4" X 1/2" saves a lot of grinding time but limits your
ability to place the tool where you might like it in your tool block. I
prefer the square ones. When you grind the tools, they are usually right
handed, so they cut near the chuck.

An example is shown in the photo below, it's the one coming
right out at the viewer. Kinda looks tilted off to one side
but it really is straight out. The side relief makes it
look a bit twisted.

http://www.metalworking.com/DropBox/_2000_retired_files/Tp3.jpg

Jim

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