CoverMate 8236 Spa Cover Lift Requires just 18 Inch clearance behind spa Powder coated, aluminum tubing with easy-to-install, non-corrosive mounting brackets  same as CoverMate I Under style system uses two aluminum brackets and 7-inch base plates that simply slide under the spa Comes standard with a Towel Mate accessory for hanging up to three towels right where you need them most