This is a larger version of the MSI-Pro 201B. I couldn't tell what the difference was before buying, so I bought both. The 225-D is made from 3/32" steel, whereas the 201-B is made from 1/16" steel. Both seem reasonably well made, but if I had known the difference I would have bought two of the 225-D instead of one of each, because the 225-D is cheaper and more heavy-duty. If you need a smaller clamp, however, the 201-B might be the better choice.