I thought it said 20 inches too! Hell, a 20 footer, he could make some serious money from one like that if cut into 6" sections.
I am now debating whether to do a Clark & Hall or a W&B FBU I have which isn't the ordinary FBU. This one is a wedge with a beveled spine. It looks better than in the pics. The hone wear doesn't look as bad. It is a hair past 15/16 at the widest point
Attachment 210314
I've had some greaseless compounds for awhile now I haven't tried on my Harbor Freight buffer & several 6" & 4" wheels. I have 80, 120, 180, 240, 320, 400 & 600 grits yet to try.