GROUND SLEEVE FOR Deluxe Internal Wind Club Tennis Posts Excellent choice to get the “Tennis Club” look with the durability of our institutional series posts - available in round or square.3” round or square, 11 gauge steel posts are powder coated green or black for excellent durability. Solid stainless steel internal worm gear winch with self locking gear mechanism to prevent re-coil during winding. Removable winch handle for safety. Nets available separately (See page 116). Ground sleeves available for semi-permanent installation.