Want a carb hole? no problem just choose your wall thickness form the table below. Want a coloured carb hole YOU MUST choose a carb hole PLUS the coloured. i.e. 3.2 carb hole is £6.00 the colouring is £8.00 the total for a coloured carb hole is £14.00. If you do not choose a coloured carb your carb will be clear glass.