Works on Cars, boats, RV's and more for Power Splitting ….. 2 PCS Removable Clear Plastic Protective shell Will fit up to the following wire size: 1X 1/0AWG and 2X 4AWG Hole sizes are as follows: Input = 12.5mm / Each output = 10.5mm Solid copper construction for safe power transfer Course threaded gold plated grub screws to solidly secure wires Gold Plated for best conduction Dimensions( CASE): Height 29mm, Width 52mm (including mounting tabs), Length 67mm