The Boat Lift Canopy Cover and Frame includes four 4 ft. aluminum pipe supports with adjustment holes for the perfect height. The unique fastening system enables this canopy to fit just about any boat lift between 108” and 120 “ wide. The kit includes four 4ft. long aluminum pipe supports and 12″ expansion sleeves to accommodate the following vertical upright dimensions: 2″ i.d round or square, 2-1/4″ i.d. square and 2-1/2″ i.d. square. Measure the inside dimension of your boat lifts vertical upright to ensure compatibility.