Rob, the one that I am looking at right now has a 15/16" octagon, made by Gunline. And they only do business with a check or PMO. It is a husband and wife business in Brea, CA.
www.gunline.com 2950 Saturn St, Brea, CA 92821 · (714) 993-5100
I believe that he offers them in several sizes, I have the 15/16" and a 7/8". They are very good scrapers - three blades on a 90* handle. They fasten on with an Allen head bolt, with an aligning pin, and spacers between the three blades. And yes, it is possible to sharpen the blades if necessary.
They are well known for their checkering tools, which are also sold by Brownell's.