Irwin makes good clamps and I have a few, this one is just "good". It's well made but would benefit from higher sides to better hold the material. I used a 3" x 1/2" MDF strip about 30" long and found it difficult to line up the corners and hold it securely with a clip so I could use my nail puller. Because the Terminal blocks are actually so small, these parts needed support at the other ends to keep them level, which would be fine for a hobbyist who collects bits and pieces, but nothing more.