... :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 ... ", 11/2", and 2" (with different dimensions)Angle box-3/4":1) Internal dimensions: 57.5 x 23mm deep ... 11/2", and 2" (with different dimensions)Way/cross box-3/4":1) Internal dimensions: 57.5 x 23mm ...