When a combined doubles (see Rule 34) and singles Court with a doubles net is used for singles, the net must be supported to a height of 3 feet 6 inches (1.07m.) by means of two posts, called "singles sticks", which shall be not more than 3 inches (7.5cm.) square or 3 inches (7.5cm.) in diameter. The centres of the singles sticks shall be 3 feet (.914m.) outside the singles Court on each side.