... 25mm, 32mm surface: Hot galvanized or galvanizati 1)Material: aluminium, grey iron, malleable iron, stainless steel,carbon steel 2) ... to BS EN60529:1992, IEC529:1989 Aluminium alloy-die casting:Way/terminal box-3/4":1) Internal dimensions: 57 ... 11/2", and 2" (with different dimensions)Way/through box-3/4":1) Internal dimensions: 57.5 x 23mm ... 11/4", 11/2", and 2" (with different dimensions) Junction Box