These are made from the same batch of steel as my much larger table legs. The glass is 3/4" thick, 1' square, held to the tables with 1/4-20 counter-sunk socket head screws. The glass was cut, drilled and polished by Cristal Vetro in Brooklyn. It turns out that 3/4" thick glass is really freakin' expensive.

Click the pics for a better view.