This is the largest focal we make! It is stunning, but a serious commitment when you sit down to melt! This takes a lot of glass. It measures 2" across and is 18mm thick. The finished bead is worth the time to make it, it is sexy, sleek and clean, even around the bead holes. This tool is made on larger stock then our regular focals. The brass block measures 2 3/4" square and is 3/4" thick. The tool is impressive.