That is a Wilton quick-release vise.
It's been sitting in that spot for a while now, waiting for me to build a bench to use it on.
Lately I've been eyeing that hole in the cabinet where the vise is sitting. I've been procrastinating making a drawer to finish it. However, lately I've been thinking about maybe mounting the vise right there in that drawer space. It would be a perfect fit. The only thing I'm worried about is warping the countertop from the extra weight on the corner. The counter is laminated two layers - 3/4" melamine on top and 3/4" MDF on the bottom, glued with Roo-Glue and screwed together. So, what do you think - give it a try? The worse that can happen is I'll have to make another countertop - wouldn't break my heart.