As other reviewers have noted, it has an odd shape. Just too long and narrow for half a sheet. Why? The clamps are stiff, but can be released by pushing them out of the latch rather than simply prying open with brute force. I like that there is a soft rubber tread on the bottom to provide a bit of cushioning, which I think helps when sanding surfaces that aren't perfectly flat (by design or age). However, since it requires an oddly large piece of sandpaper, I hardly ever used it. I would return it, but for the few dollars I paid for it as it was an "extra" item, it's not worth it.
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