Install your wake tower speakers using the Universal Fixed Wake Tower Brackets. These brackets are designed to securely fit a range of wake tower pipes. Inserts are included to suit: 63.5mm / 2.50", 60.3mm / 2.37" (NPS 2"), 57.2mm / 2.25", 50.8mm / 2.00", 48.3mm / 1.90" (NPS 1-1/2"), 42.2mm / 1.66" (NPS 1-1/4"), 33.4mm / 1.31" (NPS 1") wake tower sizes. Description Universal Fixed Tower Brackets