Central Antenna Bar - 1" x 14" TPI ThreadCentral Accessory Bar with Easy-Fit Mount Sytem for Fast Installation Features:No drilling requiredCentral bar fits to PowerTower using pre-drilled, tapped internally mounted 316 stainless backing platesEasy to retrofit or remove central barGreat for upgrades and winter storageFit single or multiple antennasAluminium Powder Coated to match overall look of the PowerTower*Only to be use with the APT-150-01 / APT-250-01