The Agrippa, or "100" style clamps were the second strongest style made. Only the "heavy service" clamps, sometimes called "bridge builder's" clamps are stronger. I believe Agrippa clamps were made in 2 or 4 inch through 18 inch sizes. They were made by both Williams and Armstrong and possibly others, and I think still made today. They were used where more force was required than the "400" or standard deep throat forged style. I have 4 each of 4 inch and 6 inch. They originally came with fairly long t-handles, but possibly could be ordered without them for wrench tightening, as the outer end of the spindle is a robust square. The feet were heavy forged, cast or machined. As welders often used these clamps, the foot pad is often missing, having been accidentally welded to something years ago! I bought mine used, and they are in general service from ordinary wood working (where they are overkill) to metal fabrication, their original purpose.
