Bill Houghton, Sebastopol, CA
I picked these Hargrave clamps up last summer, and had kind of forgotten I had them until I stumbled over them in the "no time to organize now" corner of the shop (actually, there are several of those corners). The numbered stick is inches. The bars are roughly 1-1/2" by 1/4". I'm not sure what I would ever need to clamp that would require that level of grunt; but I loved the bridge-truss construction of the heads, and the price was right.