This 16" x 11.5" shelf is a great way to add extra space for tools and free up your bench space. It’s made from solid 1/4" aluminum with a tough textured powder coated finish.You can lock this shelf into any position or let it swing and rotate freely. This shelf is extremely well made…the quality will please you. It mounts on your GRS Microscope stand or most any 1.125" diameter post.