Material: aluminium, grey iron, malleable iron, carbon steel, type: 20mm, 25mm, 32mm surface: Hot galvanized or galvanizati 1) ... :1992, IEC529:1989 Aluminium alloy-die casting:Way/terminal box-3/4":1) Internal dimensions: 57.5 x 23mm ... 11/2", and 2" (with different dimensions)Way/through box-3/4":1) Internal dimensions: 57.5 x 23mm deep2 ... ", 11/4", 11/2", and 2" (with different dimensions) Junction Box