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 cut down on my old Craftsman 109 lathe. The glass was cut, drilled and polished by Cristal Vetro in Brooklyn. It turns out that 3/4″ thick glass is very, very expensive.