1 7/8″ High Peak Side and Peak Middle No Keys (120 Degree) Canopy Fitting. This is the high pitch must boxed Carport kits are made with, there are only 2 fitting types. This fitting is used for the Peak Side and Peak Middle. The inside diameter of the opening is 1 15/16 inches. Uses 1 7/8 Chain Link Fence Tubing available at your local Hardware Store or Fence Company.